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Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
May 14, 2021
Mar. 15, 2021
Jun. 30, 2021
Jun. 30, 2021
Equity Incentive Plan 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     2,500,000 2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     1,219,583 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 55,826
Share-based Payment Arrangement, Expense     $ 205,000 $ 393,000
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