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Note 8 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale, Total $ 0 $ 43,343
Reported Value Measurement [Member]    
Cash equivalents (including restricted cash accounts) 34,832 31,675
Debt Securities, Available-for-Sale, Total 136 47,029
Fair Value, Net Asset (Liability), Total 34,420 116,436
Reported Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Asset, noncurrent [1] 3,029 37,883
Derivative Liability, Current [1] (2,777)  
Derivative Assets, current [1]   1,461
Reported Value Measurement [Member] | Currency Forward Contracts [Member]    
Derivative Liability, Current [2] (800)  
Derivative Assets, current [2]   813
Reported Value Measurement [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3]   (2,425)
Estimate of Fair Value Measurement [Member]    
Cash equivalents (including restricted cash accounts) 34,832 31,675
Debt Securities, Available-for-Sale, Total 136 47,029
Fair Value, Net Asset (Liability), Total 34,420 116,436
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Asset, noncurrent [1] 3,029 37,883
Derivative Liability, Current [1] (2,777)  
Derivative Assets, current [1]   1,461
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]    
Derivative Liability, Current [2] (800)  
Derivative Assets, current [2]   813
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3]   (2,425)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash equivalents (including restricted cash accounts) 34,832 31,675
Debt Securities, Available-for-Sale, Total 136 47,029
Fair Value, Net Asset (Liability), Total 34,968 78,704
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Asset, noncurrent [1] 0 0
Derivative Liability, Current [1] 0  
Derivative Assets, current [1]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Currency Forward Contracts [Member]    
Derivative Liability, Current [2] 0  
Derivative Assets, current [2]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3]   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 0
Fair Value, Net Asset (Liability), Total (548) 40,157
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Asset, noncurrent [1] 3,029 37,883
Derivative Liability, Current [1] (2,777)  
Derivative Assets, current [1]   1,461
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Forward Contracts [Member]    
Derivative Liability, Current [2] (800)  
Derivative Assets, current [2]   813
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3]   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 0
Fair Value, Net Asset (Liability), Total 0 (2,425)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Asset, noncurrent [1] 0 0
Derivative Liability, Current [1] 0  
Derivative Assets, current [1]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]    
Derivative Liability, Current [2] $ 0  
Derivative Assets, current [2]   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3]   $ (2,425)
[1] These amounts relate to cross currency swap contracts valued primarily based on the present value of the Cross Currency Swap future settlement prices for USD and NIS zero yield curves and the applicable exchange rate as of December 31, 2022. These amounts are included within “Deposits and other” and "Accounts payable and accrued expenses" on December 31, 2022 and within "Prepaid expenses and other" and “Deposits and other” on December 31, 2021 in the consolidated balance sheets. There are no cash collateral deposits on December 31, 2022.
[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" and "Accounts payable and accrued expenses" on December 31, 2022 and December 31, 2021, as applicable, in the consolidated balance sheet with the corresponding gain or loss being recognized within "Derivatives and foreign currency transaction gains (losses)" in the consolidated statement of operations and comprehensive income.
[3] These amounts relate to contingent payables pertaining to the Guadeloupe power plant purchase transaction, valued primarily based on unobservable inputs and are included within "Other long-term liabilities" on December 31, 2022 and 2021 in the consolidated balance sheets with the corresponding gain or loss being recognized within "Derivatives and foreign currency transaction gains (losses)" in the consolidated statement of operations and comprehensive income.