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Note 4 - Derivative Instruments and hedging activities (Details) - Effects of derivative instruments on income and other comprehensive income (OCI) (USD $) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013
Operating Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) | $ 506,509 | $ 63,942
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (140,893) | (179,609)
Cost of Revenues [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | $ 500 | $ (1,741)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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