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Note 3 - Stock-based Compensation and Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Allocated share-based compensation expense $ 31 $ 43 $ 53 $ 63    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized $ 181   $ 181      
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     32 months      
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     29,350 25,000    
Share-based compensation arrangement by share-based payment award, options, forfeitures in period     22,075 3,125    
Share-based compensation arrangement by share-based payment award, options, exercises in period       19,025    
Share-based compensation arrangement by share-based payment award, options, outstanding, number 121,225 119,400 121,225 119,400 113,950 116,550
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value     $ 5.02 $ 3.08    
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      
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     177,500      
Share-based compensation arrangement by share-based payment award, options, forfeitures in period     64,000      
Share-based compensation arrangement by share-based payment award, options, exercises in period     20,825      
Share-based compensation arrangement by share-based payment award, options, outstanding, number 121,225   121,225      
Employee Stock Option [Member] | The 2015 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     6 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