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Note 10 - Financial Instruments - Gain or Loss on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total (loss) / gain on derivatives	$ 4,741	$ (199,644)
Not Designated as Hedging Instrument [Member]
Total (loss) / gain on derivatives	5,072	(129,661)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Total (loss) / gain on derivatives	$ (331)	$ (69,983)

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: