Note 11 - Derivatives and Fair Value Disclosures (Details) - Effect of Derivative Instruments on the Statements of Income (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Swap — Reclassification from OCI	$ (49,471)	$ 67,849	$ 54,340
Total loss on derivatives	(1,348,384)	(27,470)	(1,086,258)
Other Comprehensive Income (Loss) [Member] \| Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Swap — Reclassification from OCI	(49,471)	67,849	54,340
Interest Rate Swap — Change in Fair Value	1,652,692	2,716,274	3,452,556
Interest Rate Swap — Realized loss	(1,857,362)	(2,811,593)	(4,593,154)
Other Comprehensive Income (Loss) [Member] \| Foreign Exchange Future [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Contract — Change in Fair Value	(583,368)
Foreign Currency Contract — Realized loss	$ (510,875)

Represents the realized loss on derivative instruments not designated as hedging instruments.

No definition available.

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- Definition

Represents the gains or losses transferred from accumulated other comprehensive income (loss) to the statement of income during the period.

+ References

No definition available.

+ Details

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- Definition

Represents the realized gain (loss) on foreign currency contract(s).

+ References

No definition available.

+ Details

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- Definition

Amount of realized and unrealized gain 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=56946850&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.

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- Definition

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

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