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Note 12 - Derivatives and Fair Value Disclosures - Effect of Derivative Instruments on the Statements of Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Foreign Currency Contract — Change in Fair Value		$ (298)	$ (138,653)
Total loss on derivatives	(403,943)	(766,898)	(231,931)
Interest Rate Swap [Member] | Loss on Derivatives [Member]
Interest Rate Swap — Loss reclassified from OCI (Effective portion)	(403,943)	(766,898)	(231,931)
Interest Rate Swap [Member] | Loss on Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Swap — Change in Fair Value		297,656	1,191,050
Interest Rate Swap — Realized loss		(297,954)	(1,243,359)
Foreign Currency Contract — Realized loss		297,954	1,243,359
Foreign Exchange Forward [Member] | Loss on Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Swap — Realized loss			669,712
Foreign Currency Contract — Change in Fair Value			583,368
Foreign Currency Contract — Realized loss			$ (669,712)

X

- Definition

Gain (loss) on derivative instruments that are designated as hedging instruments.

+ References

No definition available.

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X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
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-Section 50
-Paragraph 4C
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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- 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

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

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