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Note 4 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 08, 2018
Apr. 10, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.00%   0.00%    
Dividends, Common Stock, Cash     $ 0   $ 0    
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 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             510,000
Stock Incentive Plan 2018 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           300,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 471,144   471,144