000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Condensed Consolidated Balance Sheets (Unaudited) link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Condensed Consolidated Statements of Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Consolidated Statements of Shareholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 007 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) 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 - Recent Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 4 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 5 - Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 6 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 7 - Marketable Securities link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 8 - Debt link:calculationLink link:definitionLink link:presentationLink 995462 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions (Tables) link:calculationLink link:definitionLink link:presentationLink 995463 - Disclosure - Note 5 - Shareholders' Equity (Tables) link:calculationLink link:definitionLink link:presentationLink 995464 - Disclosure - Note 6 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995465 - Disclosure - Note 7 - Marketable Securities (Tables) link:calculationLink link:definitionLink link:presentationLink 995466 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions 1 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995467 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions 2 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995468 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions - Revenues Disaggregated By Revenue Source (Details) link:calculationLink link:definitionLink link:presentationLink 995469 - Disclosure - Note 4 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995470 - Disclosure - Note 5 - Shareholders' Equity (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note 5 - Shareholders' Equity - Dividend Policy (Details) link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note 5 - Shareholders' Equity - Summary of Stock-based Compensation Expense (Details) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note 6 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note 6 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note 7 - Marketable Securities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 7 - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Details) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 8 - Debt (Details Textual) link:calculationLink link:definitionLink link:presentationLink