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Note 6 - Shareholders' Equity - Schedule of Stockholders Equity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Balance $ 28,446,561 $ 35,864,471
Stock-based compensation 421,071 426,939
Stock issued 115,800 175,000
Net loss (3,294,949) (2,214,139)
Balance 25,688,483 34,252,271
Common Stock [Member]    
Balance 39,748 39,613
Stock-based compensation 0 0
Stock issued 60 100
Net loss 0 0
Balance 39,808 39,713
Treasury Stock [Member]    
Balance (18,929,915) (18,929,915)
Stock-based compensation 0 0
Stock issued 0 0
Net loss 0 0
Balance (18,929,915) (18,929,915)
Additional Paid-in Capital [Member]    
Balance 98,013,079 96,105,851
Stock-based compensation 421,071 426,939
Stock issued 115,740 174,900
Net loss 0 0
Balance 98,549,890 96,707,690
Retained Earnings [Member]    
Balance (50,676,351) (41,351,078)
Stock-based compensation 0 0
Stock issued 0 0
Net loss (3,294,949) (2,214,139)
Balance $ (53,971,300) $ (43,565,217)