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Note 9 - Accounts Payable and Accrued Expenses (Details) - Accounts Payable and Accrued Expenses (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Expenses [Abstract]    
Trade payables $ 48,283us-gaap_AccountsPayableTradeCurrent $ 49,619us-gaap_AccountsPayableTradeCurrent
Salaries and other payroll costs 10,774us-gaap_EmployeeRelatedLiabilitiesCurrent 11,711us-gaap_EmployeeRelatedLiabilitiesCurrent
Customer advances 3,768us-gaap_CustomerAdvancesCurrent 6,410us-gaap_CustomerAdvancesCurrent
Accrued interest 8,546us-gaap_InterestPayableCurrent 9,277us-gaap_InterestPayableCurrent
Income tax payable 3,164us-gaap_AccruedIncomeTaxesCurrent 224us-gaap_AccruedIncomeTaxesCurrent
Property tax payable 4,192us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 4,671us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Scheduling and transmission 1,771ora_SchedulingAndTransmissionCurrent 1,300ora_SchedulingAndTransmissionCurrent
Royalty accrual 2,104us-gaap_AccruedRoyaltiesCurrent 1,531us-gaap_AccruedRoyaltiesCurrent
Deferred revenues   5,750us-gaap_DeferredRevenueCurrent
Other 5,674us-gaap_OtherAccruedLiabilitiesCurrent 7,554us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 88,276us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 98,047us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent