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Note 11 - Financial Instruments - Gain or Loss on Derivatives Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Gain (loss) on derivatives $ (564,631) $ (2,885)
Interest Rate Contracts, Unrealized (Loss) / Gain [Member]    
Gain (loss) on derivatives (582,850) 41,435
Interest Rate Contracts, Realized (Loss) / Gain [Member]    
Gain (loss) on derivatives $ 18,219 $ (44,320)