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Note 5 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative, Notional Amount	$ 16,862,000		$ 16,862,000
Foreign Exchange Forward [Member]
Derivative, Notional Amount	16,900,000		16,900,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount	14,900,000		14,900,000
Forward Contracts [Member]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	(0.10)		(0.10)	$ 0.10
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (0.10)	$ 0.10	$ (0.10)	$ 0.10

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

+ Details

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Namespace Prefix:	invest_
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Period Type:	instant

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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- Details

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