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Note 4 - Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

						June 30, 2020
						Fair Value
		Carrying Value at June 30, 2020				Total				Level 1				Level 2				Level 3
		(Dollars in thousands)
Assets:
Current assets:
Cash equivalents (including restricted cash accounts)		$	36,661			$	36,661			$	36,661			$	—			$	—
Derivatives:
Contingent receivable ⁽¹⁾			101				101				—				—				101
Currency forward contracts ⁽²⁾			2,405				2,405				—				2,405				—
Liabilities:
Current liabilities:
Derivatives:
Contingent payables ⁽¹⁾			(2,900	)			(2,900	)			—				—				(2,900	)
		$	36,267			$	36,267			$	36,661			$	2,405			$	(2,799	)

						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 receivables ⁽¹⁾			102				102				—				—				102
Currency forward contracts ⁽²⁾			362				362				—				362				—
Liabilities:
Current liabilities:
Derivatives:
Contingent payable ⁽¹⁾			(3,359	)			(3,359	)			—				—				(3,359	)
		$	25,421			$	25,421			$	28,316			$	362			$	(3,257	)

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

				Amount of recognized gain (loss)								Amount of recognized gain (loss)
Derivatives not designated as hedging instruments		Location of recognized gain (loss)		Three Months Ended June 30,								Six Months Ended June 30,
				2020				2019				2020				2019

Currency forward contracts		Derivative and foreign currency transaction gains (losses)			1,435				616			$	2,525			$	1,699
				$	1,435			$	616			$	2,525			$	1,699

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

		Fair Value								Carrying Amount
		June 30, 2020				December 31, 2019				June 30, 2020				December 31, 2019
		(Dollars in millions)								(Dollars in millions)
Olkaria III Loan - OPIC		$	203.4			$	202.1			$	183.6			$	192.6
Olkaria III plant 4 Loan - DEG 2			43.2				43.8				40.0				42.5
Olkaria III plant 1 Loan - DEG 3			38.3				38.8				34.9				37.1
Platanares Loan - OPIC			117.7				115.3				100.4				104.5
Amatitlan Loan			24.6				26.4				24.5				26.3
Senior Secured Notes:
OFC 2 LLC ("OFC 2")			222.6				210.9				198.4				203.0
Don A. Campbell 1 ("DAC 1")			81.2				78.5				75.2				78.2
USG Prudential - NV			33.0				30.6				28.2				28.4
USG Prudential - ID			18.6				18.6				18.8				19.6
USG DOE			47.1				45.0				39.5				40.8
Senior Unsecured Bonds			294.8				205.7				285.2				204.3
Senior Unsecured Loan			231.5				161.3				200.0				150.0
Plumstriker		20.0					21.7				20.0				21.6
Other long-term debt			16.4				16.3				16.7				17.4

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			—				—				203.4				203.4
Olkaria III plant 4 Loan - DEG 2			—				—				43.2				43.2
Olkaria III plant 1 Loan - DEG 3			—				—				38.3				38.3
Platanares Loan - OPIC			—				—				117.7				117.7
Amatitlan Loan			—				24.6				—				24.6
Senior Secured Notes:
OFC 2 Senior Secured Notes			—				—				222.6				222.6
DAC 1 Senior Secured Notes			—				—				81.2				81.2
USG Prudential - NV			—				—				33.0				33.0
USG Prudential - ID			—				—				18.6				18.6
USG DOE			—				—				47.1				47.1
Senior Unsecured Bonds			—				—				294.8				294.8
Senior Unsecured Loan			—				—				231.5				231.5
Plumstriker			—				20.0				—				20.0
Other long-term debt			—				—				16.4				16.4
Commercial paper			—				3.8				—				3.8
Revolving lines of credit			—				100.1				—				100.1
Deposits			12.2				—				—				12.2

		Level 1				Level 2				Level 3				Total
		(Dollars in millions)
Olkaria III Loan - OPIC			—				—				202.1				202.1
Olkaria IV - DEG 2			—				—				43.8				43.8
Olkaria IV - 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