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Note 9 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating losses $ 15,097us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 16,064us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accruals not currently deductible 14,868us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 12,901us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Unrealized foreign exchange 3,145us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses  
Bad debts 597us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 1,166us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Foreign tax credits 862us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 1,653us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Capitalized inventory costs and other 4,867us-gaap_DeferredTaxAssetsInventory 4,135us-gaap_DeferredTaxAssetsInventory
Total deferred tax assets 39,436us-gaap_DeferredTaxAssetsGross 35,919us-gaap_DeferredTaxAssetsGross
Valuation allowance (15,353)us-gaap_DeferredTaxAssetsValuationAllowance (15,024)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets, net of allowances 24,083us-gaap_DeferredTaxAssetsNet 20,895us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Accelerated depreciation and amortization (40,308)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (29,530)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Tax on unremitted earnings (6,680)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (6,169)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Other (3,025)us-gaap_DeferredTaxLiabilitiesOther (1,607)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (50,013)us-gaap_DeferredIncomeTaxLiabilities (37,306)us-gaap_DeferredIncomeTaxLiabilities
Total net deferred tax liabilities (25,930)us-gaap_DeferredTaxLiabilities (16,411)us-gaap_DeferredTaxLiabilities
Current portion of deferred tax assets 11,013us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 11,272us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non current portion of deferred tax assets 1,258us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 119us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Current portion of deferred tax liabilities (507)us-gaap_DeferredTaxLiabilitiesCurrent (742)us-gaap_DeferredTaxLiabilitiesCurrent
Non current portion of deferred tax liabilities (37,694)us-gaap_DeferredTaxLiabilitiesNoncurrent (27,060)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liabilities $ (25,930)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (16,411)us-gaap_DeferredTaxAssetsLiabilitiesNet