Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Stock-based Incentive Plans (Details Textual)

v3.21.1
Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended
Mar. 15, 2021
Mar. 31, 2021
Equity Incentive Plan 2016 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   1,219,583
The Phantom Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years  
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 223,307  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) 3 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 27,913  
Share-based Payment Arrangement, Expense   $ 188,000
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payment Per Share (in dollars per share) $ 12.00