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Note 5 - Long-term Debt - Convertible Note (Details) - Convertible Debt [Member] - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Convertible Note $ 16,800,000 $ 0
Less: unamortized debt issuance costs (2,796,591) 0
Convertible Note payable 14,003,409 0
Current portion of Convertible Note payable 3,360,000 0
Convertible Note payable, less current portion $ 10,643,409 $ 0