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Note 11 - Stock Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Directors Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   10 years    
Share-based Payment Arrangement, Expense     $ 348,877 $ 394,933
Common Class A [Member]        
Common Stock, Capital Shares Reserved for Future Issuance   1,045,848 1,045,848 832,233
Common Class A [Member] | Omnibus 2013 Equity Plan [Member]        
Common Stock, Capital Shares Reserved for Future Issuance   400,000 400,000 150,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 250,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     12,000 30,333
Common Class A [Member] | Directors Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   5,000 5,000