Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stock Based Compensation (Details Textual)

v3.21.2
Note 9 - Stock Based Compensation (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Feb. 17, 2015
Share-based Payment Arrangement, Expense $ 428 $ 309  
Share Based Compensation Expense, Estimated Future Compensation, Total 950    
Share Based Compensation Expense, Estimated For Remainder of Fiscal Year 142    
Share Based Compensation Expense, Estimated For Year One 464    
Share Based Compensation Expense, Estimated For Year Two 291    
Share Based Compensation Expense, Estimated For Year Three $ 53    
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) 19,693 13,243  
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