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Note 5 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale, Total $ 42,927 $ 43,343
Reported Value Measurement [Member]    
Cash equivalents (including restricted cash accounts) 31,453 31,675
Debt Securities, Available-for-Sale, Total 46,976 47,029
Fair Value, Net Asset (Liability), Total 107,337 116,436
Reported Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Assets, current [1] 569 1,461
Cross currency swap (3) [1] 30,188 37,883
Reported Value Measurement [Member] | Currency Forward Contracts [Member]    
Derivative Assets, current [2] 536 813
Reported Value Measurement [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3] (2,385) (2,425)
Estimate of Fair Value Measurement [Member]    
Cash equivalents (including restricted cash accounts) 31,453 31,675
Debt Securities, Available-for-Sale, Total 46,976 47,029
Fair Value, Net Asset (Liability), Total 107,337 116,436
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Assets, current [1] 569 1,461
Cross currency swap (3) [1] 30,188 37,883
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]    
Derivative Assets, current [2] 536 813
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3] (2,385) (2,425)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash equivalents (including restricted cash accounts) 31,453 31,675
Debt Securities, Available-for-Sale, Total 46,976 47,029
Fair Value, Net Asset (Liability), Total 78,429 78,704
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Assets, current [1] 0 0
Cross currency swap (3) [1] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Currency Forward Contracts [Member]    
Derivative Assets, current [2] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3] 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 0
Fair Value, Net Asset (Liability), Total 31,293 40,157
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Assets, current [1] 569 1,461
Cross currency swap (3) [1] 30,188 37,883
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Forward Contracts [Member]    
Derivative Assets, current [2] 536 813
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3] 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 0
Fair Value, Net Asset (Liability), Total (2,385) (2,425)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]    
Derivative Assets, current [1] 0 0
Cross currency swap (3) [1] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]    
Derivative Assets, current [2] 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]    
Derivatives, noncurrent [3] $ (2,385) $ (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 U.S. Dollar ("USD") and New Israeli Shekel ("NIS") zero yield curves and the applicable exchange rate as of March 31, 2022 and December 31, 2021, as applicable. These amounts are included within "Prepaid expenses and other" and “Deposits and other”, as applicable, in the condensed consolidated balance sheets as of March 31, 2022 and December 31, 2021. There are no cash collateral deposits on March 31, 2022 and December 31, 2021.
[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” in the condensed consolidated balance sheets as of March 31, 2022 and December 31, 2021, 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 contingent payables and warrants pertaining to the Guadeloupe power plant purchase transaction, valued primarily based on unobservable inputs and are included within “Other long-term liabilities” in the condensed consolidated balance sheets as of March 31, 2022 and December 31, 2021, 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.