Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stock Based Compensation (Details Textual)

v3.22.1
Note 9 - Stock Based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Feb. 17, 2015
Share-Based Payment Arrangement, Expense $ 169,000 $ 146,000  
Share Based Compensation Expense, Estimated Future Compensation, Total $ 1,600    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 24 days    
2015 Stock Option and Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     250,000
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 18,891 17,716  
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years