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Note 6 - Stock Compensation Plan (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Feb. 28, 2021
Feb. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 783   783        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 0   0        
Share-Based Payment Arrangement, Expense $ 101,000 $ 112,000 $ 221,000 $ 224,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 692,000   $ 692,000        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     0        
Share-Based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)         10 years    
The 2021 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           204,091  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 192,591   192,591        
The 2014 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)             176,866
The 2014 Plan [Member] | Share-Based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 88,433   88,433