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Note 10 - Long-term Debt - Maturities of Long-term Debt (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
2020 $ 5,818,182  
2021 5,818,182  
2022 4,363,636  
Thereafter  
Total 16,000,000  
Less: Unamortized discount (91,520)  
Less: Unamortized debt issuance costs (30,359)  
Less: Current portion of long-term debt (5,585,637) $ (316,906)
Long-term debt, noncurrent $ 10,292,484 $ 11,627,643