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Note 4 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Finance liability - Dixie Valley |  | $ 224.2 | $ 207.2
HSBC 2024 Loan Agreement [Member] |  |  |
Loans |  | 126.5 |
Mammoth Senior Secured Notes [Member] |  |  |
Loans |  | 137.4 |
Mizrahi Loan Agreement [Member] |  |  |
Loans |  | 61.2 | 61.4
Mizrahi Loan Agreement 2023 [Member] |  |  |
Loans |  | 51.8 | 52.0
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 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
Estimate of Fair Value Measurement [Member] |  |  |
Finance liability - Dixie Valley |  | 224.2 | 207.2
Other long-term debt |  | 6.7 | 6.8
Estimate of Fair Value Measurement [Member] | Hapoalim Loan Agreement 2024 [Member] |  |  |
Loans |  | 75.9 | 0.0
Estimate of Fair Value Measurement [Member] | HSBC 2024 Loan Agreement [Member] |  |  |
Loans |  | 126.5 | 0.0
Estimate of Fair Value Measurement [Member] | Mammoth Senior Secured Notes [Member] |  |  |
Loans |  | 137.4 | 0.0
Estimate of Fair Value Measurement [Member] | Mizrahi Loan Agreement [Member] |  |  |
Loans |  | 61.2 | 61.4
Estimate of Fair Value Measurement [Member] | Mizrahi Loan Agreement 2023 [Member] |  |  |
Loans |  | 51.8 | 52.0
Estimate of Fair Value Measurement [Member] | Convertible Senior Notes [Member] |  |  |
Notes |  | 417.4 | 444.6
Estimate of Fair Value Measurement [Member] | HSBC Loan Agreement [Member] |  |  |
Loans |  | 30.1 | 33.8
Estimate of Fair Value Measurement [Member] | Hapoalim Loan Agreement [Member] |  |  |
Loans |  | 76.0 | 75.0
Estimate of Fair Value Measurement [Member] | Hapoalim Loan Agreement 2023 [Member] |  |  |
Loans |  | 93.5 | 99.7
Estimate of Fair Value Measurement [Member] | Discount Loan Agreement [Member] |  |  |
Loans |  | 63.2 | 69.9
Estimate of Fair Value Measurement [Member] | Olkaria III OPIC [Member] |  |  |
Loans |  | 111.6 | 116.4
Estimate of Fair Value Measurement [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member] |  |  |
Loans |  | 22.0 | 21.6
Estimate of Fair Value Measurement [Member] | Olkaria III plant 1 Loan - DEG 3 [Member] |  |  |
Loans |  | 19.3 | 19.0
Estimate of Fair Value Measurement [Member] | Platanares Loan - OPIC [Member] |  |  |
Loans |  | 68.8 | 71.3
Estimate of Fair Value Measurement [Member] | OFC Senior Secured Notes [Member] |  |  |
Notes |  | 128.9 | 134.2
Estimate of Fair Value Measurement [Member] | Don A. Campbell 1 ("DAC1") [Member] |  |  |
Notes |  | 50.5 | 52.3
Estimate of Fair Value Measurement [Member] | USG Prudential - NV [Member] |  |  |
Notes |  | 22.0 | 22.3
Estimate of Fair Value Measurement [Member] | USG Prudential - ID [Member] |  |  |
Notes |  | 51.2 | 54.1
Estimate of Fair Value Measurement [Member] | USG DOE [Member] |  |  |
Notes |  | 28.2 | 30.0
Estimate of Fair Value Measurement [Member] | Senior Unsecured Bonds [Member] |  |  |
Senior Unsecured Bond |  | 198.5 | 202.8
Estimate of Fair Value Measurement [Member] | Senior Unsecured Loan [Member] |  |  |
Senior Unsecured Bond |  | 139.7 | 150.4
Reported Value Measurement [Member] |  |  |
Finance liability - Dixie Valley |  | 223.3 | 225.8
Other long-term debt | [1] | 6.8 | 7.7
Reported Value Measurement [Member] | Hapoalim Loan Agreement 2024 [Member] |  |  |
Loans | [1] | 75.0 | 0.0
Reported Value Measurement [Member] | HSBC 2024 Loan Agreement [Member] |  |  |
Loans |  | 125.0 | 0.0
Reported Value Measurement [Member] | Mammoth Senior Secured Notes [Member] |  |  |
Loans |  | 135.1 | 0.0
Reported Value Measurement [Member] | Mizrahi Loan Agreement [Member] |  |  |
Loans | [1] | 60.9 | 60.9
Reported Value Measurement [Member] | Mizrahi Loan Agreement 2023 [Member] |  |  |
Loans |  | 50.0 | 50.0
Reported Value Measurement [Member] | Convertible Senior Notes [Member] |  |  |
Notes | [1] | 431.3 | 431.3
Reported Value Measurement [Member] | HSBC Loan Agreement [Member] |  |  |
Loans | [1] | 32.1 | 35.7
Reported Value Measurement [Member] | Hapoalim Loan Agreement [Member] |  |  |
Loans |  | 80.4 | 80.4
Reported Value Measurement [Member] | Hapoalim Loan Agreement 2023 [Member] |  |  |
Loans |  | 90.0 | 95.0
Reported Value Measurement [Member] | Discount Loan Agreement [Member] |  |  |
Loans | [1] | 68.8 | 75.0
Reported Value Measurement [Member] | Olkaria III OPIC [Member] |  |  |
Loans | [1] | 116.2 | 120.7
Reported Value Measurement [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member] |  |  |
Loans | [1] | 22.5 | 22.5
Reported Value Measurement [Member] | Olkaria III plant 1 Loan - DEG 3 [Member] |  |  |
Loans | [1] | 19.7 | 19.7
Reported Value Measurement [Member] | Platanares Loan - OPIC [Member] |  |  |
Loans | [1] | 69.6 | 71.7
Reported Value Measurement [Member] | OFC Senior Secured Notes [Member] |  |  |
Notes |  | 142.5 | 142.5
Reported Value Measurement [Member] | Don A. Campbell 1 ("DAC1") [Member] |  |  |
Notes |  | 55.8 | 57.4
Reported Value Measurement [Member] | USG Prudential - NV [Member] |  |  |
Notes | [1] | 23.8 | 23.9
Reported Value Measurement [Member] | USG Prudential - ID [Member] |  |  |
Notes |  | 57.2 | 58.9
Reported Value Measurement [Member] | USG DOE [Member] |  |  |
Notes | [1] | 28.7 | 30.2
Reported Value Measurement [Member] | Senior Unsecured Bonds [Member] |  |  |
Senior Unsecured Bond | [1] | 217.3 | 220.6
Reported Value Measurement [Member] | Senior Unsecured Loan [Member] |  |  |
Senior Unsecured Bond | [1] | $ 149.6 | $ 158.0
[1] | Carrying amount value excludes the related deferred financing costs.

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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