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Note 5 - Derivative Instruments and Hedging Activities (Details Textual) - Forward Contracts [Member] - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Derivative, Notional Amount | $ 6,900,000 |  | $ 6,900,000 |  | $ 26,600,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | 55,128 | $ (39,401) | 78,173 | $ (100,000) |
Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative, Notional Amount | 6,200,000 |  | 6,200,000 |  | $ 24,000,000
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | $ (1,053) | $ 20,113 | $ 37,103 | $ 300,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives 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=84234895&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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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