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Note 14 - Derivative Financial Instruments - Gain or Loss on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total net gain / (loss) on derivatives $ (2,885) $ (44,343) $ 12,389
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts, Unrealized (Loss) / Gain [Member]      
Total net gain / (loss) on derivatives 204,647 (5,901)
Not Designated as Hedging Instrument [Member] | Freight Forward Agreements, Unrealized Gain (Loss) [Member]      
Total net gain / (loss) on derivatives (781)
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts, Realized (Loss) / Gain [Member]      
Total net gain / (loss) on derivatives (2,885) (201,745) 19,071
Not Designated as Hedging Instrument [Member] | Freight Forward Agreements, Realized Gain (Loss) [Member]      
Total net gain / (loss) on derivatives (47,245)
Not Designated as Hedging Instrument [Member] | Interest Rate Swap Contracts, Fair Value [Member]      
Total net gain / (loss) on derivatives (2,885) 2,902 13,170
Not Designated as Hedging Instrument [Member] | Freight Forward Agreements [Member]      
Total net gain / (loss) on derivatives $ (47,245) $ (781)