000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Consolidated Balance Sheets link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Consolidated Balance Sheets (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Consolidated Statements of Income link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Consolidated Statements of Comprehensive Income link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Consolidated Statements of Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Consolidated Statements of Shareholders' Equity (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 007 - Statement - Consolidated Statements of Cash Flows link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 1 - Overview and Basis of Presentation link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 2 - Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 3 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 4 - Marketable Securities link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 5 - Revenue Recognition and Sales Commissions link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 6 - Property and Equipment link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 7 - Goodwill and Intangible Assets link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 8 - Business Combinations link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 9 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 10 - Stock-based Compensation link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 11 - Employee Benefit Plan link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 12 - Debt link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 13 - Leases link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 14 - Litigation link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 15 - Non-marketable Equity Investments link:calculationLink link:definitionLink link:presentationLink 995469 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 995470 - Disclosure - Note 1 - Overview and Basis of Presentation (Tables) link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note 2 - Shareholders' Equity (Tables) link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note 3 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note 4 - Marketable Securities (Tables) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note 5 - Revenue Recognition and Sales Commissions (Tables) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note 6 - Property and Equipment (Tables) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 7 - Goodwill and Intangible Assets (Tables) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 9 - Income Taxes (Tables) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note 10 - Stock-based Compensation (Tables) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note 13 - Leases (Tables) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note 1 - Overview and Basis of Presentation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Changes in the Allowance for Doubtful Accounts and the Amounts Charged to Bad Debt Expense (Details) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note 2 - Shareholders' Equity (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note 2 - Shareholders' Equity - Dividend Policy (Details) link:calculationLink link:definitionLink link:presentationLink 995485 - Disclosure - Note 3 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995486 - Disclosure - Note 3 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 995487 - Disclosure - Note 4 - Marketable Securities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995488 - Disclosure - Note 4 - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Details) link:calculationLink link:definitionLink link:presentationLink 995489 - Disclosure - Note 5 - Revenue Recognition and Sales Commissions 1 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995490 - Disclosure - Note 5 - Revenue Recognition and Sales Commissions 2 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995491 - Disclosure - Note 5 - Revenue Recognition and Sales Commissions - Revenues Disaggregated By Revenue Source (Details) link:calculationLink link:definitionLink link:presentationLink 995492 - Disclosure - Note 6 - Property and Equipment (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995493 - Disclosure - Note 6 - Property and Equipment - Summary of Property and Equipment (Details) link:calculationLink link:definitionLink link:presentationLink 995494 - Disclosure - Note 7 - Goodwill and Intangible Assets (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995495 - Disclosure - Note 7 - Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) link:calculationLink link:definitionLink link:presentationLink 995496 - Disclosure - Note 7 - Goodwill and Intangible Assets - Identifiable Intangible Assets (Details) link:calculationLink link:definitionLink link:presentationLink 995497 - Disclosure - Note 7 - Goodwill and Intangible Assets - Expected Annual Amortization Expense (Details) link:calculationLink link:definitionLink link:presentationLink 995498 - Disclosure - Note 8 - Business Combinations (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995499 - Disclosure - Note 9 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995500 - Disclosure - Note 9 - Income Taxes - Schedule of Components of Earnings Before Income Taxes (Details) link:calculationLink link:definitionLink link:presentationLink 995501 - Disclosure - Note 9 - Income Taxes - Summary of Provision for Income Taxes (Details) link:calculationLink link:definitionLink link:presentationLink 995502 - Disclosure - Note 9 - Income Taxes - Reconciliation of Income Taxes at the Statutory Federal Income Tax Rate to the Provision for Income Taxes (Details) link:calculationLink link:definitionLink link:presentationLink 995503 - Disclosure - Note 9 - Income Taxes - Reconciliation of the Beginning and Ending Liability for Gross Unrecognized Tax Benefits (Details) link:calculationLink link:definitionLink link:presentationLink 995504 - Disclosure - Note 9 - Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995505 - Disclosure - Note 10 - Stock-based Compensation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995506 - Disclosure - Note 10 - Stock Based Compensation - Stock Option Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995507 - Disclosure - Note 10 - Stock Based Compensation - RSUs Activities (Details) link:calculationLink link:definitionLink link:presentationLink 995508 - Disclosure - Note 10 - Stock Based Compensation - Stock Based Compensation Expense (Details) link:calculationLink link:definitionLink link:presentationLink 995509 - Disclosure - Note 11 - Employee Benefit Plan (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995510 - Disclosure - Note 12 - Debt (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995511 - Disclosure - Note 13 - Leases (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995512 - Disclosure - Note 13 - Leases - Lease-related Assets and Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995513 - Disclosure - Note 13 - Leases - Maturities of Lease Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995514 - Disclosure - Note 15 - Non-marketable Equity Investments (Details Textual) link:calculationLink link:definitionLink link:presentationLink