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Note 5 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Total $ 45,479 $ 0
Reported Value Measurement [Member]    
Cash equivalents (including restricted cash accounts) 30,052 28,653
Debt Securities, Available-for-sale, Total 45,479  
Fair Value, Net Asset (Liability), Total 92,484 52,685
Reported Value Measurement [Member] | Contingent Receivable [Member]    
Derivative Asset, Current [1]   111
Reported Value Measurement [Member] | Currency Forward Contracts [Member]    
Derivatives, current [2] 441  
Derivative Asset, Current [2]   1,554
Reported Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]    
Derivatives, current (235) [2] (2,283) [3]
Derivative Asset, Noncurrent [3] 19,240 27,829
Reported Value Measurement [Member] | Contingent Payable [Member]    
Derivatives, current [1]   (549)
Derivatives, noncurrent [1] (2,493) (2,630)
Estimate of Fair Value Measurement [Member]    
Cash equivalents (including restricted cash accounts) 30,052 28,653
Debt Securities, Available-for-sale, Total 45,479  
Fair Value, Net Asset (Liability), Total 92,484 52,685
Estimate of Fair Value Measurement [Member] | Contingent Receivable [Member]    
Derivative Asset, Current [1]   111
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]    
Derivatives, current [2] 441  
Derivative Asset, Current [2]   1,554
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]    
Derivatives, current (235) [2] (2,283) [3]
Derivative Asset, Noncurrent [3] 19,240 27,829
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]    
Derivatives, current [1]   (549)
Derivatives, noncurrent [1] (2,493) (2,630)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash equivalents (including restricted cash accounts) 30,052 28,653
Debt Securities, Available-for-sale, Total 45,479  
Fair Value, Net Asset (Liability), Total 75,531 28,653
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Receivable [Member]    
Derivative Asset, Current [1]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Currency Forward Contracts [Member]    
Derivatives, current [2] 0  
Derivative Asset, Current [2]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivatives, current 0 [2] 0 [3]
Derivative Asset, Noncurrent [3] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Payable [Member]    
Derivatives, current [1]   0
Derivatives, noncurrent [1] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash equivalents (including restricted cash accounts) 0 0
Debt Securities, Available-for-sale, Total 0  
Fair Value, Net Asset (Liability), Total 19,446 27,100
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Receivable [Member]    
Derivative Asset, Current [1]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Forward Contracts [Member]    
Derivatives, current [2] 441  
Derivative Asset, Current [2]   1,554
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivatives, current (235) [2] (2,283) [3]
Derivative Asset, Noncurrent [3] 19,240 27,829
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Payable [Member]    
Derivatives, current [1]   0
Derivatives, noncurrent [1] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash equivalents (including restricted cash accounts) 0 0
Debt Securities, Available-for-sale, Total 0  
Fair Value, Net Asset (Liability), Total (2,493) (3,068)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Receivable [Member]    
Derivative Asset, Current [1]   111
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]    
Derivatives, current [2] 0  
Derivative Asset, Current [2]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivatives, current 0 [2] 0 [3]
Derivative Asset, Noncurrent [3] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]    
Derivatives, current [1]   (549)
Derivatives, noncurrent [1] $ (2,493) $ (2,630)
[1] These amounts relate to contingent receivables and payables and warrants pertaining to the Guadeloupe power plant purchase transaction, valued primarily based on unobservable inputs and are included within “Prepaid expenses and other”, “Accounts payable and accrued expenses” and “Other long-term liabilities” on September 30, 2021 and December 31, 2020, as applicable, in the condensed consolidated balance sheets with the corresponding gain or loss being recognized within "Derivatives and foreign currency transaction gains (losses)" in the condensed consolidated statements of operations and comprehensive income.
[2] These amounts relate to currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, net of contracted rates and then multiplied by notional amounts, and are included within “Receivables, other” on September 30, 2021 and December 31, 2020, in the condensed consolidated balance sheets with the corresponding gain or loss being recognized within “Derivatives and foreign currency transaction gains (losses)” in the condensed consolidated statements of operations and comprehensive income.
[3] These amounts relate to cross currency swap contracts valued primarily based on the present value of the cross currency swap future settlement prices for U.S. Dollar ("USD") and New Israeli Shekel ("NIS") zero yield curves and the applicable exchange rate as of September 30, 2021 and December 31, 2020, as applicable. These amounts are included within “Deposits and other” and "Accounts payable and accrued expenses", as applicable, on September 30, 2021 and December 31, 2020 in the condensed consolidated balance sheets. There are no cash collateral deposits on September 30, 2021 and December 31, 2020.