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Note 7 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Fair Value, by Balance Sheet Grouping [Table Text Block]

						December 31, 2017
						Fair Value
		Carrying Value at December 31, 2017				Total				Level 1				Level 2				Level 3
		(Dollars in thousands)
Assets:
Current assets:
Cash equivalents (including restricted cash accounts)		$	18,359			$	18,359			$	18,359			$	—			$	—
Derivatives:
Contingent receivable (1)			108				108				—				—				108
Currency forward contracts (2)			992				992				—				992				—
Liabilities:
Current liabilities:
Derivatives:
Contingent payables (1)			(13,904	)			(13,904	)			—				—				(13,904	)
Warrants (1)			(3,967	)			(3,967	)			—				—				(3,967	)
		$	1,588			$	1,588			$	18,359			$	992			$	(17,763	)

						December 31, 2016
						Fair Value
		Carrying Value at December 31, 2016				Total				Level 1				Level 2				Level 3
		(Dollars in thousands)
Assets
Current assets:
Cash equivalents (including restricted cash accounts)		$	14,922			$	14,922			$	14,922			$	—			$	—
Derivatives:
Contingent receivable (1)			1,443				1,443				—				—				1,443
Liabilities:
Current liabilities:
Derivatives:
Contingent payables (1)			(11,581	)			(11,581	)			—				—				(11,581	)
Warrants (1)			(3,429	)			(3,429	)			—				—				(3,429	)
Currency forward contracts (2)			(481	)			(481	)			—				(481	)			—
		$	874			$	874			$	14,922			$	(481	)		$	(13,567	)

Derivative Instruments, Gain (Loss) [Table Text Block]

Derivatives not designated as hedging instruments		Location of recognized gain (loss)		Amount of recognized gain (loss)
				2017				2016				2015
				(Dollars in thousands)
Put options on natural gas price		Derivative and foreign currency transaction gains (losses)			(350	)			—				—
Call options on natural gas price		Derivative and foreign currency transaction gains (losses)			—				(1,340	)			—
Call and put options on oil price		Derivative and foreign currency transaction gains (losses)			—				(1,313	)			—
Swap transactions on natural gas price		Electricity revenues			—				—				1,158
Contingent considerations		Derivative and foreign currency transaction gains (losses)			(129	)			(1,527	)			—
Contingent considerations		General and administrative expenses			2,048				—				—
Currency forward contracts		Derivative and foreign currency transaction gains (losses)			3,699				238				(1,206	)
				$	5,268			$	(3,942	)		$	(48	)

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

		Fair Value								Carrying Amount
		2017				2016				2017				2016
		(Dollars in millions)								(Dollars in millions)
Olkaria III Loan - DEG		$	—			$	16.3			$	—			$	15.8
Olkaria III Loan - OPIC			234.6				253.4				228.6				246.6
Olkaria IV Loan - DEG 2			50.7				50.9				50.0				50.0
Amatitlan Loan			32.8				37.3				33.3				36.8
Senior Secured Notes:
Ormat Funding Corp. ("OFC")			—				17.0				—				17.0
OrCal Geothermal Inc. ("OrCal")			34.2				37.4				32.1				35.2
OFC 2 LLC ("OFC 2")			234.6				249.0				232.5				247.2
Don A. Campbell 1 ("DAC 1")			85.5				88.9				88.3				92.4
Senior Unsecured Bonds			200.3				200.1				204.3				204.3
Other long-term debt			7.0				10.4				7.9				11.2

Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

		Level 1				Level 2				Level 3				Total
		(Dollars in millions)
Olkaria III - OPIC		$	—			$	—			$	234.6			$	234.6
Olkaria IV - DEG 2			—				—				50.7				50.7
Amatitlan Loan			—				32.8				—				32.8
Senior Secured Notes:
OrCal Senior Secured Notes			—				—				34.2				34.2
OFC 2 Senior Secured Notes			—				—				234.6				234.6
DAC 1 Senior Secured Notes			—				—				85.5				85.5
Senior Unsecured Bonds			—				—				200.3				200.3
Other long-term debt			—				—				7.0				7.0
Revolving lines of credit			—				51.5				—				51.5
Deposits			15.6				—				—				15.6

		Level 1				Level 2				Level 3				Total
		(Dollars in millions)
Olkaria III Loan - DEG		$	—			$	—			$	16.3			$	16.3
Olkaria III Loan - OPIC			—				—				253.4				253.4
Olkaria IV - DEG 2											50.9				50.9
Amatitlan Loan			—				37.3				—				37.3
Senior Secured Notes:
OFC Senior Secured Notes			—				17.0				—				17.0
OrCal Senior Secured Notes			—				—				37.4				37.4
OFC 2 Senior Secured Notes			—				—				249.0				249.0
DAC 1 Senior Secured Notes			—				—				88.9				88.9
Senior Unsecured Bonds			—				—				200.1				200.1
Other long-term debt			—				3.3				7.1				10.4
Revolving lines of credit			—				—				—				—
Deposits			14.4				—				—				14.4

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