000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Condensed Consolidated Statements of Operations (Unaudited) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 006 - Disclosure - Note A - Basis of Presentation link:calculationLink link:definitionLink link:presentationLink 007 - Disclosure - Note B - Recent Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note C - Revenue Recognition link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note D - Marketable Equity Securities link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note E - Stock-based Compensation link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note F - Segment Information link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note G - Treasury Stock link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note H - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note I - Income Taxes link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note J - Fair Value of Financial Instruments link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note K - Notes Payable link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note L - Litigation link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note M - Leases link:calculationLink link:definitionLink link:presentationLink 995465 - Disclosure - Note D - Marketable Equity Securities (Tables) link:calculationLink link:definitionLink link:presentationLink 995466 - Disclosure - Note E - Stock-based Compensation (Tables) link:calculationLink link:definitionLink link:presentationLink 995467 - Disclosure - Note F - Segment Information (Tables) link:calculationLink link:definitionLink link:presentationLink 995468 - Disclosure - Note H - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995469 - Disclosure - Note J - Fair Value of Financial Instruments (Tables) link:calculationLink link:definitionLink link:presentationLink 995470 - Disclosure - Note M - Leases (Tables) link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note C - Revenue Recognition (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note D - Marketable Equity Securities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note D - Marketable Equity Securities - Securities Classified As Available-for-sale (Details) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note D - Marketable Equity Securities - Unrealized Gains and Losses on Marketable Equity Securities (Details) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note D - Marketable Equity Securities - Realized Gains on Marketable Equity Securities (Details) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note E - Stock-based Compensation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note E - Stock-based Compensation - Summary of Nonvested Restricted Stock (Details) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note F - Segment Information (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note F - Segment Information - Segment Revenue Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note G - Treasury Stock (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note H - Earnings Per Share - Computations of Basic and Diluted Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note I - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note J - Fair Value of Financial Instruments - Securities Measured at Fair Value on a Recurring Basis (Details) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note J - Fair Value of Financial Instruments - Fair Value of Long-term Debt Other Than Lines of Credit (Details) link:calculationLink link:definitionLink link:presentationLink 995485 - Disclosure - Note K - Notes Payable (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995486 - Disclosure - Note L - Litigation 1 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995487 - Disclosure - Note L - Litigation 2 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995488 - Disclosure - Note M - Leases (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995489 - Disclosure - Note M - Leases - Maturity of Lease Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 995490 - Disclosure - Note M - Leases - Lease Cost (Details) link:calculationLink link:definitionLink link:presentationLink 995491 - Disclosure - Note M - Leases - Lease Revenue (Details) link:calculationLink link:definitionLink link:presentationLink 995492 - Disclosure - Note M - Leases - Lease Receivables (Details) link:calculationLink link:definitionLink link:presentationLink