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Note 5 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
xbrli-pure in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Apr. 10, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%   0.00%  
Share-based Payment Arrangement, Expense $ 20,000 $ 34,000 $ 72,000 $ 139,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total 118,000   118,000      
Expected Recognized Compensation Expenses, Remainder of the Fiscal Year 18,000   18,000      
Expected Recognized Compensation Expenses in Year Two $ 56,000   $ 56,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 471,144   471,144   471,144  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 83,000   $ 83,000      
Stock Incentive Plan 2009 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           510,000
Stock Incentive Plan 2018 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 471,144   471,144