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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, 2017
Jun. 30, 2016
Gain (loss) on derivatives $ (29,053) $ (264,887)
Not Designated as Hedging Instrument [Member]    
Gain (loss) on derivatives 2,298 (181,707)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]    
Gain (loss) on derivatives $ (31,351) $ (83,180)