Annual report pursuant to Section 13 and 15(d)

Note 9 - Stock-based Incentive Plans (Details Textual)

v3.24.0.1
Note 9 - Stock-based Incentive Plans (Details Textual) - USD ($)
12 Months Ended
Feb. 07, 2023
Feb. 06, 2023
May 14, 2021
Mar. 15, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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         $ 161,000    
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 295,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 1 month 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         31,914 186,245  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)         62,320 0 186,245
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)         3,666    
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)         1,125,349    
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         $ 551,000 $ 575,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Payment Per Share (in dollars per share) $ 12            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         106,468    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)         106,469    
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      
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     223,307  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)           0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)           9,074