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Note 4 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Finance liability - Dixie Valley | $ 224.2 | $ 207.2
Deposit | 20.0 | 20.9
Hapoalim 2024 Loan Agreement [Member] |  |
Loans | 75.9 |
Mizrahi Loan Agreement [Member] |  |
Loans | 61.2 | 61.4
HSBC 2024 Loan Agreement [Member] |  |
Loans | 126.5 |
Mizrahi Loan Agreement 2023 [Member] |  |
Loans | 51.8 | 52.0
Mammoth Senior Secured Notes [Member] |  |
Loans | 137.4 |
Convertible Senior Notes [Member] |  |
Notes | 417.4 | 444.6
HSBC Loan Agreement [Member] |  |
Loans | 30.1 | 33.8
Hapoalim Loan Agreement [Member] |  |
Loans | 76.0 | 75.0
Hapoalim Loan Agreement 2023 [Member] |  |
Loans | 93.5 | 99.7
Discount Loan Agreement [Member] |  |
Loans | 63.2 | 69.9
Olkaria III Loan DFC [Member] |  |
Loans | 111.6 | 116.4
Olkaria III Plant 4 Loan - DEG 2 [Member] |  |
Loans | 22.0 | 21.6
Olkaria III plant 1 Loan - DEG 3 [Member] |  |
Loans | 19.3 | 19.0
Platanares Loan - OPIC [Member] |  |
Loans | 68.8 | 71.3
OFC Senior Secured Notes [Member] |  |
Notes | 128.9 | 134.2
Don A. Campbell 1 ("DAC1") [Member] |  |
Notes | 50.5 | 52.3
USG Prudential - NV [Member] |  |
Notes | 22.0 | 22.3
USG Prudential - ID [Member] |  |
Notes | 51.2 | 54.1
USG DOE [Member] |  |
Notes | 28.2 | 30.0
Senior Unsecured Bonds [Member] |  |
Senior Unsecured Bond | 198.5 | 202.8
Senior Unsecured Loan [Member] |  |
Senior Unsecured Bond | 139.7 | 150.4
Other Long-term Debt [Member] |  |
Senior Unsecured Bond | 6.7 | 6.8
Fair Value, Inputs, Level 1 [Member] |  |
Finance liability - Dixie Valley | 0.0 | 0.0
Deposit | 20.0 | 20.9
Fair Value, Inputs, Level 1 [Member] | Hapoalim 2024 Loan Agreement [Member] |  |
Loans | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Mizrahi Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | HSBC 2024 Loan Agreement [Member] |  |
Loans | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Mizrahi Loan Agreement 2023 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Mammoth Senior Secured Notes [Member] |  |
Loans | 0.0 |
Fair Value, Inputs, Level 1 [Member] | Convertible Senior Notes [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | HSBC Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Hapoalim Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Hapoalim Loan Agreement 2023 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Discount Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Olkaria III Loan DFC [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Platanares Loan - OPIC [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | OFC Senior Secured Notes [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Don A. Campbell 1 ("DAC1") [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | USG Prudential - NV [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | USG Prudential - ID [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | USG DOE [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Bonds [Member] |  |
Senior Unsecured Bond | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Loan [Member] |  |
Senior Unsecured Bond | 0.0 | 0.0
Fair Value, Inputs, Level 1 [Member] | Other Long-term Debt [Member] |  |
Senior Unsecured Bond | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] |  |
Finance liability - Dixie Valley | 0.0 | 0.0
Deposit | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Hapoalim 2024 Loan Agreement [Member] |  |
Loans | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Mizrahi Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | HSBC 2024 Loan Agreement [Member] |  |
Loans | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Mizrahi Loan Agreement 2023 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Mammoth Senior Secured Notes [Member] |  |
Loans | 0.0 |
Fair Value, Inputs, Level 2 [Member] | Convertible Senior Notes [Member] |  |
Notes | 417.4 | 444.6
Fair Value, Inputs, Level 2 [Member] | HSBC Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Hapoalim Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Hapoalim Loan Agreement 2023 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Discount Loan Agreement [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Olkaria III Loan DFC [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Platanares Loan - OPIC [Member] |  |
Loans | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | OFC Senior Secured Notes [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Don A. Campbell 1 ("DAC1") [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | USG Prudential - NV [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | USG Prudential - ID [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | USG DOE [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Senior Unsecured Bonds [Member] |  |
Senior Unsecured Bond | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Senior Unsecured Loan [Member] |  |
Senior Unsecured Bond | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Other Long-term Debt [Member] |  |
Senior Unsecured Bond | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] |  |
Finance liability - Dixie Valley | 224.2 | 207.2
Deposit | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Hapoalim 2024 Loan Agreement [Member] |  |
Loans | 75.9 |
Fair Value, Inputs, Level 3 [Member] | Mizrahi Loan Agreement [Member] |  |
Loans | 61.2 | 61.4
Fair Value, Inputs, Level 3 [Member] | HSBC 2024 Loan Agreement [Member] |  |
Loans | 126.5 |
Fair Value, Inputs, Level 3 [Member] | Mizrahi Loan Agreement 2023 [Member] |  |
Loans | 51.8 | 52.0
Fair Value, Inputs, Level 3 [Member] | Mammoth Senior Secured Notes [Member] |  |
Loans | 137.4 |
Fair Value, Inputs, Level 3 [Member] | Convertible Senior Notes [Member] |  |
Notes | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | HSBC Loan Agreement [Member] |  |
Loans | 30.1 | 33.8
Fair Value, Inputs, Level 3 [Member] | Hapoalim Loan Agreement [Member] |  |
Loans | 76.0 | 75.0
Fair Value, Inputs, Level 3 [Member] | Hapoalim Loan Agreement 2023 [Member] |  |
Loans | 93.5 | 99.7
Fair Value, Inputs, Level 3 [Member] | Discount Loan Agreement [Member] |  |
Loans | 63.2 | 69.9
Fair Value, Inputs, Level 3 [Member] | Olkaria III Loan DFC [Member] |  |
Loans | 111.6 | 116.4
Fair Value, Inputs, Level 3 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member] |  |
Loans | 22.0 | 21.6
Fair Value, Inputs, Level 3 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member] |  |
Loans | 19.3 | 19.0
Fair Value, Inputs, Level 3 [Member] | Platanares Loan - OPIC [Member] |  |
Loans | 68.8 | 71.3
Fair Value, Inputs, Level 3 [Member] | OFC Senior Secured Notes [Member] |  |
Notes | 128.9 | 134.2
Fair Value, Inputs, Level 3 [Member] | Don A. Campbell 1 ("DAC1") [Member] |  |
Notes | 50.5 | 52.3
Fair Value, Inputs, Level 3 [Member] | USG Prudential - NV [Member] |  |
Notes | 22.0 | 22.3
Fair Value, Inputs, Level 3 [Member] | USG Prudential - ID [Member] |  |
Notes | 51.2 | 54.1
Fair Value, Inputs, Level 3 [Member] | USG DOE [Member] |  |
Notes | 28.2 | 30.0
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Bonds [Member] |  |
Senior Unsecured Bond | 198.5 | 202.8
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Loan [Member] |  |
Senior Unsecured Bond | 139.7 | 150.4
Fair Value, Inputs, Level 3 [Member] | Other Long-term Debt [Member] |  |
Senior Unsecured Bond | $ 6.7 | $ 6.8

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