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Note 14 - Stock-based Compensation (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2012
Dec. 31, 2004
Feb. 11, 2014
Mar. 31, 2014
Apr. 02, 2014
Nov. 05, 2014
May 31, 2014
Mar. 31, 2021
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) $ 8,146,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized     $ 8,146,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 146 days                    
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Annual ForfeitureRate 5.60%ora_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate 5.60%ora_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate                        
Increase (Decrease) in Stock-based Compensation Expense Due to Forfeitures     0.80%ora_IncreaseDecreaseInStockBasedCompensationExpenseDueToForfeitures                      
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Dividends Growth Rate       20.00%ora_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDividendsGrowthRate                    
Share-based Compensation Arrangement By Share-based Payment Award Fair Value Assumptions Weighted Average Expected Dividend Rate       0.70%ora_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsWeightedAverageExpectedDividendRate                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       485,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 45,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)       $ 29.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 26.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 19.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                
Development Stage Entities, Equity Issuance, Per Share Amount (in Dollars per share)       $ 27.18us-gaap_EquityIssuancePerShareAmount $ 27.21us-gaap_EquityIssuancePerShareAmount                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 895,354us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber 811,269us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber   895,354us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber 811,269us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)       $ 2,036,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 140,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue                  
Share Price (in Dollars per share) $ 27.49us-gaap_SharePrice $ 23.57us-gaap_SharePrice   $ 27.49us-gaap_SharePrice $ 23.57us-gaap_SharePrice                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       243,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 39,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                
Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche One [Member] | 2004 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year Two               25.00%ora_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPercentageYearTwo
/ us-gaap_AwardTypeAxis
= ora_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember		            
Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche One [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             24 months 24 months            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= ora_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember		              
Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Two [Member] | 2004 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period               36 months            
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year Three               25.00%ora_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPercentageYearThree
/ us-gaap_AwardTypeAxis
= ora_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember		            
Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Two [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             36 months              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= ora_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember		              
Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Three [Member] | 2004 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period               48 months            
Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Percentage Year Four               50.00%ora_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPercentageYearFour
/ us-gaap_AwardTypeAxis
= ora_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember		            
Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Three [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             48 months              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= ora_StockOptionsAndStockAppreciationRightsMember
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember		              
Employee Stock Option [Member] | Non Employee Director [Member] | 2004 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period               1 year            
Employee Stock Option [Member] | Non Employee Director [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             1 year              
Employee Stock Option [Member] | Chief Financial Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                 5 years          
Options to Purchase 300,000 Shares of Common Stock [Member] | Chief Executive Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                   $ 12.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ora_OptionsToPurchaseThreeHundredThousandSharesOfCommonStockMember
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		        
Options to Purchase 100,000 Shares of Common Stock [Member] | Chief Executive Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                     $ 8.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ora_OptionsToPurchaseOneHundredThousandSharesOfCommonStockMember
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		      
Subsequent Event [Member] | Chief Executive Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number                           100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
One Year from the Grant Date [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                       100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_VestingAxis
= ora_OneYearFromTheGrantDateMember		    
Maximum [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years              
Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized                         400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember		  
Chief Financial Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures                 32,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember		          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)                 24.57us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember		          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                 5.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember		          
Chief Executive Officer [Member] | 2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                     4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                   7 years 6 years      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)                     $ 29.52us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		             400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		      
2004 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance               3,750,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember		            
Share Based Compensation Arrangement By Share Based Payment Award Awards Exercise Period               10 years            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember		     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember		                    
2012 Stock Incentive Plan [Member]                            
Note 14 - Stock-based Compensation (Details) [Line Items]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember		              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                       7 years    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)                       28.23us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                       7.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                       52,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,124,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember		     2,124,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ora_The2012StockIncentivePlanMember