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Note 6 - Stock-Based Compensation (Details)
 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2004
May 31, 2012
Mar. 31, 2015
Stock Options And Stock Appreciation Rights [Member] | 2004 Stock Incentive Plan [Member] | Share-based Compensation Award, Tranche One [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
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_The2004StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 24 months    
Stock Options And Stock Appreciation Rights [Member] | 2004 Stock Incentive Plan [Member] | Share-based Compensation Award, Tranche Two [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
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_The2004StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 36 months    
Stock Options And Stock Appreciation Rights [Member] | 2004 Stock Incentive Plan [Member] | Share-based Compensation Award, Tranche Three [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
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_The2004StockIncentivePlanMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 48 months    
Stock Options And Stock Appreciation Rights [Member] | 2012 Stock Incentive Plan [Member] | Share-based Compensation Award, Tranche One [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
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		  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   24 months  
Stock Options And Stock Appreciation Rights [Member] | 2012 Stock Incentive Plan [Member] | Share-based Compensation Award, Tranche Two [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
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		  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   36 months  
Stock Options And Stock Appreciation Rights [Member] | 2012 Stock Incentive Plan [Member] | Share-based Compensation Award, Tranche Three [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
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		  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   48 months  
Employee Stock Option [Member] | 2004 Stock Incentive Plan [Member] | Non Employee Director [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Employee Stock Option [Member] | 2012 Stock Incentive Plan [Member] | Non Employee Director [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year  
2004 Stock Incentive Plan [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ora_The2004StockIncentivePlanMember		    
Share Based Compensation Arrangement By Share Based Payment Award Awards Exercise Period 10 years    
2012 Stock Incentive Plan [Member] | Minimum [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   6 years  
2012 Stock Incentive Plan [Member] | Maximum [Member]      
Note 6 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years  
2012 Stock Incentive Plan [Member] | Officer [Member]      
Note 6 - 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
2012 Stock Incentive Plan [Member]      
Note 6 - 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