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Note 3 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 08, 2018
Dec. 31, 2017
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      
Allocated Share-based Compensation Expense, Total $ 44,000 $ 5,000 106,000 $ 10,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 258,000   258,000        
Expected Recognized Compensation Expenses, Remainder of the Fiscal Year 66,000   66,000        
Expected Recognized Compensation Expenses in Year Two 92,000   92,000        
Expected Recognized Compensation Expenses in Year Three $ 56,000   $ 56,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 471,144   471,144     476,144  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 287,000   $ 287,000        
Stock Incentive Plan 2009 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             510,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 471,144   471,144        
Stock Incentive Plan 2018 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         300,000