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Note 11 - Derivatives and Fair Value Disclosures (Detail) - Effect of Derivative Instruments on the Statements of Income (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Total loss on derivatives | $ (1,086,258) | $ (2,931,404) | $ (6,071,638)
Other Comprehensive Income (Loss) [Member] | Interest Rate Swap [Member] |  |  |
Interest Rate Swap — Reclassification from OCI | 54,340 | (527,627) | (481,515)
Interest Rate Swap — Change in Fair Value | 3,452,556 | 2,200,415 | (1,274,421)
Interest Rate Swap — Realized loss | (4,593,154) | (5,497,478) | (6,087,631)
Other Comprehensive Income (Loss) [Member] | Foreign Exchange Future [Member] |  |  |
Foreign Currency Contract — Change in Fair Value |  | (5,407,633) | 1,771,929
Foreign Currency Contract — Realized gain |  | $ 6,300,919 |

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- Definition Gain included in earnings for the period from the change in fair value of derivative instruments not designated 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=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument. + 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=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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