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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)

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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 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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- 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 + Details
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