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Note 3 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Apr. 10, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00%      
Dividends, Common Stock, Cash $ 0   $ 0  
Allocated Share-based Compensation Expense, Total 62,000 $ 5,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total 302,000      
Expected Recognized Compensation Expenses, Remainder of the Fiscal Year 110,000      
Expected Recognized Compensation Expenses in Year Two 92,000      
Expected Recognized Compensation Expenses in Year Three $ 56,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 471,144   476,144  
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      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 37,000