XML 34 R32.htm IDEA: XBRL DOCUMENT v2.4.1.9
Note 5 - Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 06, 2014
mJ
Oct. 16, 2013
mJ
Sep. 03, 2013
mJ
Mar. 31, 2014
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]          
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (in Dollars) $ 23us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax        
NGI Swap Contract [Member]          
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]          
Derivative, Nonmonetary Notional Amount, Energy Measure (in Millijoules)   2,200,000us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NGISwapContractMember
4,200,000us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NGISwapContractMember
4,400,000us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NGISwapContractMember
 
Underlying, Derivative Energy Measure   4.95us-gaap_UnderlyingDerivativeEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NGISwapContractMember
4.103us-gaap_UnderlyingDerivativeEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NGISwapContractMember
4.035us-gaap_UnderlyingDerivativeEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NGISwapContractMember
 
New York Harbor ULSD Swap Contract [Member]          
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]          
Underlying, Derivative Energy Measure     125.150us-gaap_UnderlyingDerivativeEnergyMeasure
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NewYorkHarborULSDSwapContractMember
   
Derivative, Nonmonetary Notional Amount, Volume (in Barrels (of Oil))     275,000us-gaap_DerivativeNonmonetaryNotionalAmountVolume
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NewYorkHarborULSDSwapContractMember
   
Fluctuation in Energy Rate (in Megawatt-hours)     25ora_FluctuationInEnergyRate
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NewYorkHarborULSDSwapContractMember
   
Interest Rate Cap [Member]          
Note 5 - Fair Value of Financial Instruments (Details) [Line Items]          
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (in Dollars) $ (300)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
      $ 2,400us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember