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Note 7 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

						December 31, 2019
						Fair Value
		Carrying Value at December 31, 2019				Total				Level 1				Level 2				Level 3
		(Dollars in thousands)
Assets:
Current assets:
Cash equivalents (including restricted cash accounts)		$	28,316			$	28,316			$	28,316			$	—			$	—
Derivatives:
Contingent receivable ⁽¹⁾			102				102				—				—				102
Currency forward contracts ⁽²⁾			362				362				—				362				—
Liabilities:
Current liabilities:
Derivatives:
Contingent payables ⁽¹⁾			(3,359	)			(3,359	)			—				—				(3,359	)
		$	25,421			$	25,421			$	28,316			$	362			$	(3,257	)

						December 31, 2018
						Fair Value
		Carrying Value at December 31, 2018				Total				Level 1				Level 2				Level 3
		(Dollars in thousands)
Assets
Current assets:
Cash equivalents (including restricted cash accounts)		$	18,787			$	18,787			$	18,787			$	—			$	—
Derivatives:
Contingent receivable ⁽¹⁾			104				104				—				—				104
Liabilities:
Current liabilities:
Derivatives:
Contingent payables ⁽¹⁾			(3,424	)			(3,424	)			—				—				(3,424	)
Currency forward contracts ⁽²⁾			(1,040	)			(1,040	)			—				(1,040	)			—
		$	14,427			$	14,427			$	18,787			$	(1,040	)		$	(3,320	)

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

Derivatives not designated as hedging instruments		Location of recognized gain (loss)		Amount of recognized gain (loss)
				2019				2018				2017
				(Dollars in thousands)

Put options on natural gas price		Derivative and foreign currency transaction gains (losses)		$	—			$	—			$	(350	)
Contingent considerations		Derivative and foreign currency transaction gains (losses)			—				170				(129	)
Contingent considerations		General and administrative expenses			—				10,322				2,048
Currency forward contracts		Derivative and foreign currency transaction gains (losses)			2,556				(3,081	)			3,699
				$	2,556			$	7,411			$	5,268

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

		Fair Value								Carrying Amount
		2019				2018				2019				2018
		(Dollars in millions)								(Dollars in millions)
Olkaria III Loan - OPIC		$	202.1			$	211.8			$	192.6			$	210.6
Olkaria III plant 4 Loan - DEG 2			43.8				47.2				42.5				47.5
Olkaria III plant 1 Loan - DEG 3			38.8				—				37.1				—
Platanares Loan - OPIC			115.3				119.1				104.5				112.7
Amatitlan Loan			26.4				29.9				26.3				29.8
Senior Secured Notes:
OrCal Geothermal Inc. ("OrCal")			—				19.0				—				18.7
OFC 2 LLC ("OFC 2")			210.9				214.5				203.0				217.8
Don A. Campbell 1 ("DAC 1")			78.5				78.8				78.2				83.3
USG Prudential - NV			30.6				29.4				28.4				27.8
USG Prudential - ID			18.6				18.6				19.6				18.9
USG DOE			45.0				48.3				40.8				51.4
Senior Unsecured Bonds			205.7				199.4				204.3				204.3
Senior Unsecured Loan			161.3				102.2				150.0				100.0
Plumstriker			21.7				—				21.6				—
Other long-term debt			16.3				5.4				17.4				6.2

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		$	—			$	—			$	202.1			$	202.1
Olkaria III plant 4 - DEG 2			—				—				43.8				43.8
Olkaria III plant 1 - DEG 3			—				—				38.8				38.8
Platanares Loan - OPIC			—				—				115.3				115.3
Amatitlan Loan			—				26.4				—				26.4
Senior Secured Notes:
OFC 2 Senior Secured Notes			—				—				210.9				210.9
DAC 1 Senior Secured Notes			—				—				78.5				78.5
USG Prudential - NV			—				—				30.6				30.6
USG Prudential - ID			—				—				18.6				18.6
USG DOE			—				—				45.0				45.0
Senior Unsecured Bonds			—				—				205.7				205.7
Senior Unsecured Loan			—				—				161.3				161.3
Plumstriker			—				21.7				—				21.7
Other long-term debt			—				—				16.3				16.3
Commercial paper			—				50.0				—				50.0
Revolving lines of credit			—				40.6				—				40.6
Deposits			12.2				—				—				12.2

		Level 1				Level 2				Level 3				Total
		(Dollars in millions)
Olkaria III Loan - OPIC		$	—			$	—			$	211.8			$	211.8
Olkaria III plant 4 - DEG 2			—				—				47.2				47.2
Platanares Loan - OPIC			—				—				119.1				119.1
Amatitlan Loan			—				29.9				—				29.9
Senior Secured Notes:
OrCal Senior Secured Notes			—				—				19.0				19.0
OFC 2 Senior Secured Notes			—				—				214.5				214.5
DAC 1 Senior Secured Notes			—				—				78.8				78.8
USG Prudential - NV			—				—				29.4				29.4
USG Prudential - ID			—				—				18.6				18.6
USG DOE			—				—				48.3				48.3
Senior Unsecured Bonds			—				—				199.4				199.4
Senior Unsecured Loan			—				—				102.2				102.2
Other long-term debt			—				—				5.4				5.4
Revolving lines of credit			—				159.0				—				159.0
Deposits			12.0				—				—				12.0