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 Stockholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 006 - Disclosure - Note 1 - General and Liquidity link:calculationLink link:definitionLink link:presentationLink 007 - Disclosure - Note 2 - Significant Accounting Policies link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 3 - Prepaid Expenses and Other Current Assets link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 4 - Real Property and Other Income, Expense link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 5 - Property and Equipment link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 6 - Stockholders' Equity and Stock-based Compensation Expense link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 7 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 8 - Commitments link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 9 - 2020 Cash Incentive Bonus Plan link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 10 - Contingencies link:calculationLink link:definitionLink link:presentationLink 995462 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 995463 - Disclosure - Note 2 - Significant Accounting Policies (Tables) link:calculationLink link:definitionLink link:presentationLink 995464 - Disclosure - Note 3 - Prepaid Expenses and Other Current Assets (Tables) link:calculationLink link:definitionLink link:presentationLink 995465 - Disclosure - Note 4 - Real Property and Other Income, Expense (Tables) link:calculationLink link:definitionLink link:presentationLink 995466 - Disclosure - Note 5 - Property and Equipment (Tables) link:calculationLink link:definitionLink link:presentationLink 995467 - Disclosure - Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Tables) link:calculationLink link:definitionLink link:presentationLink 995468 - Disclosure - Note 1 - General and Liquidity (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995469 - Disclosure - Note 2 - Significant Accounting Policies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995470 - Disclosure - Note 2 - Significant Accounting Policies - Summary of CODM Segments (Details) link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note 2 - Significant Accounting Policies - Calculation of Net Loss Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note 3 - Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Details) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note 4 - Real Property and Other Income, Expense (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note 4 - Real Property and Other Income, Expense - Components of Other Income, Net (Details) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note 4 - Real Property and Other Income, Expense - Schedule of Gross Rental Income under Third-party Leases (Details) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 5 - Property and Equipment (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 5 - Property and Equipment - Components of Property and Equipment (Details) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note 6 - Stockholders' Equity and Stock-based Compensation Expense (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note 6 - Stockholders' Equity and Stock-based Compensation Expense - Stock Option and Performance Award Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note 6 - Stockholders' Equity and Stock-based Compensation - Stock-based Compensation Expense (Details) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note 7 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note 8 - Commitments (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note 9 - 2020 Cash Incentive Bonus Plan (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note 10 - Contingencies (Details Textual) link:calculationLink link:definitionLink link:presentationLink