Annual report pursuant to Section 13 and 15(d)

Note 12 - Stock-based Compensation (Details Textual)

v3.22.1
Note 12 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jun. 01, 2016
May 18, 2006
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     2,904,500 2,904,500 1,395,000 1,349,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 1,200,704 $ 1,200,704    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)       10 months    
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)     1,590,000 1,590,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)     1,000,000 1,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     3,410,000 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)     940,500 940,500 606,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)     578,000 578,000 371,000  
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)     374,000 374,000 789,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)     374,000 374,000 789,000