Annual report pursuant to Section 13 and 15(d)

Note 14 - Stock-based Compensation (Details Textual)

v3.23.1
Note 14 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended 15 Months Ended
Jun. 01, 2016
May 18, 2006
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     4,552,500 4,552,500 2,904,500 1,395,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 1,709,838 $ 1,709,838    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)     9 months 15 days      
The 2021 Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     5,000,000 5,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     3,507,000 3,507,000 1,590,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)     1,295,000 1,295,000 1,000,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     1,458,000 1,458,000 3,410,000  
The 2016 Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,000,000          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     773,500 773,500 940,500  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)     629,750 629,750 578,000  
The 2006 Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   1,950,000        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     272,000 272,000 374,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)     756,888 756,888 1,179,855