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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)

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=109980867&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=109980867&loc=SL5624171-113959

+ Details

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Balance Type:	credit
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X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
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- Details

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X

- Details

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