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Note 10 - Financial Instruments - Gain or Loss on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Interest rate – Unrealized gain $ (2,885) $ 5,154
Not Designated as Hedging Instrument [Member]    
Interest rate – Unrealized gain (2,885) 5,154
Not Designated as Hedging Instrument [Member] | Interest Rate Swap Contracts, Fair Value [Member]    
Interest rate – Unrealized gain 41,435 142,216
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts, Realized (Loss) / Gain [Member]    
Interest rate – Unrealized gain $ (44,320) $ (137,062)