Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.1
Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended
May 14, 2021
Mar. 15, 2021
Mar. 31, 2022
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 27,913
Share-Based Payment Arrangement, Expense     $ 196,000 $ 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    
The Phantom Plan [Member] | Phantom Shares [Member] | NewNonEmployeeDirectorsMember        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 9,074      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 9,074