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Note 18 - Income Taxes (Details) - Difference Between US Federal Statutory Tax Rate and Company's Effective Tax Rate
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Difference Between US Federal Statutory Tax Rate and Company's Effective Tax Rate [Abstract]      
U.S. federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Valuation allowance (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (3.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (8.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax monetization 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther    
State income tax, net of federal benefit (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effect of foreign income tax, net (4.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (7.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Production tax credits 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Dividends from foreign subsidiaries     (39.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends
Subpart F income 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 4.70%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings  
Depletion (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion   0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion
Other, net 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 32.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations