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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative, Notional Amount | $ 9,300,000 | $ 20,400,000 | $ 9,300,000 | $ 20,400,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | 28,977 | 100,000 |  |
Derivative, Gain (Loss) on Derivative, Net |  |  | 300,000 | 100,000
Forward Contracts [Member] |  |  |  |
Derivative, Notional Amount | 11,000,000 | 24,000,000 | 11,000,000 | 24,000,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | (21,008) | $ (100,000) |  |
Derivative, Gain (Loss) on Derivative, Net |  |  | (100,000) | $ (200,000)
Derivative, Notional Amount | $ 10,955,000 |  | $ 10,955,000 |

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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 increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: 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=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + 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=64837297&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=64837297&loc=SL5618551-113959 + Details
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