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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)

X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

+ Details

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