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 Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 007 - Disclosure - Note 1 - Basis of Presentation link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 2 - Recent Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 4 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 5 - Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 6 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 7 - Marketable Securities link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 8 - Business Segments link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 9 - Debt link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions (Tables) link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 5 - Shareholders' Equity (Tables) link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 6 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 7 - Marketable Securities (Tables) link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 8 - Business Segments (Tables) link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions 1 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions 2 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Note 3 - Revenue Recognition and Sales Commissions - Revenues Disaggregated By Revenue Source (Details) link:calculationLink link:definitionLink link:presentationLink 025 - Disclosure - Note 4 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 026 - Disclosure - Note 5 - Shareholders' Equity (Details Textual) link:calculationLink link:definitionLink link:presentationLink 027 - Disclosure - Note 5 - Shareholders' Equity - Summary of Stock-based Compensation Expense (Details) link:calculationLink link:definitionLink link:presentationLink 028 - Disclosure - Note 6 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 029 - Disclosure - Note 6 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 030 - Disclosure - Note 7 - Marketable Securities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 031 - Disclosure - Note 7 - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Details) link:calculationLink link:definitionLink link:presentationLink 032 - Disclosure - Note 8 - Business Segments - Business Segment Information Based on Net Revenues and Operating Income (Details) link:calculationLink link:definitionLink link:presentationLink 033 - Disclosure - Note 8 - Business Segments - Business Segment Information Based on Assets (Details) link:calculationLink link:definitionLink link:presentationLink 034 - Disclosure - Note 9 - Debt (Details Textual) link:calculationLink link:definitionLink link:presentationLink