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Note 4 - Derivative instrument assets/liabilities: (Detail) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 Forward Contracts [Member] | Dec. 31, 2011 Forward Contracts [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member]
Derivative, Remaining Maturity |  |  |  | 1 month | 18 months
Notional Amount of Cash Flow Hedge Instruments |  | $ 29.3 | $ 30.4 |  |
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives | $ 15.1 |  |  |  |

X
- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: 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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Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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 + Details
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