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Note 5 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

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

			Fair Value at September 30, 2013
		Cost or Amortized Cost at September 30, 2013	Total		Level 1		Level 2		Level 3
	(Dollars in thousands)
Assets
Current assets:
Cash equivalents (including restricted cash accounts)	$	67,234	$	67,234	$	67,234	$	—	$	—
Derivatives:
Put options on oil price⁽¹⁾		—		142		—		142		—
Currency forward contracts⁽²⁾		—		2,952		—		2,952		—
Swap transaction on natural gas price⁽³⁾		—		1,353		—		1,353		—
	$	67,234	$	71,681	$	67,234	$	4,447	$	—

			Fair Value at December 31, 2012
		Cost or Amortized Cost at December 31, 2012	Total		Level 1		Level 2		Level 3
	(Dollars in thousands)
Assets
Current assets:
Cash equivalents (including restricted cash accounts)	$	54,298	$	54,298	$	54,298	$	—	$	—
Derivatives:
Put options on oil price⁽¹⁾		—		1,842		—		1,842		—
Currency forward contracts⁽²⁾		—		1,675		—		1,675		—
Swap transaction on natural gas price⁽³⁾		—		2,804		—		2,804		—
Swap transaction on oil price⁽⁴⁾		—		336		—		336		—
	$	54,298	$	60,955	$	54,298	$	6,657	$	—

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

		Amount of recognized gain (loss)
Derivatives not designated as hedging instruments	Location of recognized gain (loss)	Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(Dollars in thousands)						(Dollars in thousands)
Put options on oil price	Electricity revenues	$	(824	)	$	(198	)	$	(1,256	)	$	(198	)
Swap transaction on oil price	Electricity revenues		—			(3,197	)		(294	)		1,123
Swap transactions on natural gas price	Electricity revenues		477			(421	)		81			(872	)
Currency forward contracts	Foreign currency translation and transaction gains (losses)		1,970			(137	)		4,895			(774	)

		$	1,623		$	(3,953	)	$	3,426		$	(721	)

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

	Fair Value				Carrying Amount
	September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012
	(Dollars in millions)				(Dollars in millions)
Olkaria III loan - DEG	$	44.7	$	48.8	$	43.4	$	47.4
Olkaria III Loan - OPIC		241.4		220.0		258.8		220.0
Amatitlan loan		35.7		38.9		32.2		34.3
Senior secured notes:
Ormat Funding LLC ("OFC")		88.5		105.0		96.2		114.1
OrCal Geothermal LLC ("OrCal")		74.8		77.3		74.0		76.5
OFC 2 LLC ("OFC 2")		121.3		131.2		146.6		150.5
Senior unsecured bonds		265.8		273.2		250.7		250.9
Loans from institutional investors		22.2		27.7		21.5		27.0

Fair Value, Measurement Inputs, Disclosure [Text Block]

	Level 1		Level 2		Level 3		Total
	(Dollars in millions)
Olkaria III loan - DEG	$	—	$	—	$	44.7	$	44.7
Olkaria III loan - OPIC		—		—		241.4		241.4
Amatitlan loan		—		—		35.7		35.7
Senior secured notes:
OFC		—		88.5		—		88.5
OrCal		—		—		74.8		74.8
OFC 2		—		—		121.3		121.3
Senior unsecured bonds		—		—		265.8		265.8
Loan from institutional investors		—		—		22.2		22.2
Other long-term debt		—		28.3		—		28.3
Revolving lines of credit		—		123.3		—		123.3
Deposits		21.0		—		—		21.0

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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