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Note 12 - Stock Compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   0 2,000 3,000  
Share-based Payment Arrangement, Expense   $ 429,344 $ 296,899    
Directors Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)   10 years      
Share-based Payment Arrangement, Expense   $ 8,775 $ 0    
Common Class A [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   1,002,848 1,042,848    
Common Class A [Member] | Omnibus 2013 Equity Plan [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)       400,000 150,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 250,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   23,700 17,250    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     271,000    
Common Class A [Member] | Directors Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   5,000