Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.2
Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Feb. 07, 2023
Feb. 06, 2023
May 14, 2021
Mar. 15, 2021
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Restricted Stock [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   97,900         97,900  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   3 years            
Share-Based Payment Arrangement, Expense         $ 39,000   $ 85,000  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 388,000   $ 388,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 4 months 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)             16,324  
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)         1,121,683   1,121,683  
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) 212,937     223,307        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years        
Share-Based Payment Arrangement, Expense         $ 133,000 $ 153,000 $ 260,000 $ 349,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payment Per Share (in dollars per share) $ 12.00              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         26,617 27,913 53,234 55,826
The Phantom Plan [Member] | Phantom Shares [Member] | Employees and Non-Employee Directors [Member] | Vesting Increments [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years              
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