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Note 6 - Derivative Instruments and Hedging Activities (Details) - Forward Contracts [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Note 6 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Notional Amount	$ 31,000,000	$ 22,800,000	$ 31,000,000	$ 22,800,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	(100,000)	(25,000)	(300,000)	(200,000)
Designated as Hedging Instrument [Member]
Note 6 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Notional Amount	26,400,000	19,000,000	26,400,000	19,000,000
Not Designated as Hedging Instrument [Member]
Note 6 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 100,000	$ 100,000	$ 200,000	$ 20,000

X

- 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

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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=56946850&loc=SL5618551-113959



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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



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-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4C



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