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Note 3 - Stock-based Compensation and Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 54 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Allocated share-based compensation expense $ 24 $ 26 $ 84 $ 84      
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 143   $ 143   $ 143    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     29 months        
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     24,700 25,000      
Share-based compensation arrangement by share-based payment award, options, forfeitures in period     1,500 1,600      
Share-based compensation arrangement by share-based payment award, options, exercises in period     8,775 10,000      
Share-based compensation arrangement by share-based payment award, options, outstanding, number 109,500 98,925 109,500 98,925 109,500 95,075 85,525
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value     $ 3.96 $ 5.29      
The 2005 Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award, number of shares authorized 200,000   200,000   200,000    
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     184,200        
Share-based compensation arrangement by share-based payment award, options, forfeitures in period     65,850        
Share-based compensation arrangement by share-based payment award, options, exercises in period     104,200        
Share-based compensation arrangement by share-based payment award, options, outstanding, number 14,150   14,150   14,150    
The 2015 Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award, number of shares authorized 300,000   300,000   300,000    
Share-based compensation arrangement by share-based payment award, options, grants in period, gross         98,200    
Share-based compensation arrangement by share-based payment award, options, forfeitures in period         2,600    
Share-based compensation arrangement by share-based payment award, options, exercises in period         250    
Share-based compensation arrangement by share-based payment award, options, outstanding, number 93,350   93,350   93,350    
Employee Stock Option [Member] | The 2005 Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-based compensation arrangement by share-based payment award, period options can be exercised after grant date     9 months        
Share-based compensation arrangement by share-based payment award, expiration period     5 years        
Share-based compensation arrangement by share-based payment award, award vesting period     3 years