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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)

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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

+ Details

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: