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Note 4 - Derivative Instruments and hedging activities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 4 - Derivative Instruments and hedging activities (Details) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net			$ 16,000
Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Note 4 - Derivative Instruments and hedging activities (Details) [Line Items]
Derivative, Notional Amount	25,500,000		25,500,000
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Note 4 - Derivative Instruments and hedging activities (Details) [Line Items]
Derivative, Notional Amount	15,100,000		15,100,000
Derivative Asset, Notional Amount	7,300,000		7,300,000
Forward Contracts [Member]
Note 4 - Derivative Instruments and hedging activities (Details) [Line Items]
Derivative, Notional Amount	32,800,000		32,800,000
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 600,000	$ 28,000,000,000	$ 800,000	$ (400,000)

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

+ Details

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X

- Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

+ Details

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X

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or 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 (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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