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Note 1 - General and Basis of Presentation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Notes Tables |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
Trade receivables and others (1) |  | $ | 4.4 |
Deferred income taxes |  |  | 3.1 |
Property, plant and equipment and construction-in-process (2) |  |  | 197.7 |
Operating lease right of use |  |  | 1.2 |
Other long-term assets |  |  | 0.2 |
Intangible assets (3) |  |  | 23.6 |
Goodwill (4) |  |  | 60.7 |
Total assets acquired |  | $ | 290.9 |
Accounts payable, accrued expenses and others |  | $ | 1.5 |
Other current liabilities |  |  | 1.8 |
Operating lease liabilities |  |  | 1.2 |
Other long-term liabilities |  |  | 5.0 |
Asset retirement obligation |  |  | 6.8 |
Total liabilities assumed |  | $ | 16.3 |
Total assets acquired, and liabilities assumed, net |  | $ | 274.6 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Pro forma for the Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
|  | (Dollars in millions) |
Electricity revenues |  | $ | 191.3 |  |  | $ | 179.8 |
Total revenues |  | $ | 224.2 |  |  | $ | 194.7 |
Net income attributable to the Company's stockholders |  | $ | 39.9 |  |  | $ | 27.7 |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
|  | (Dollars in thousands) |
Cash and cash equivalents |  | $ | 201,506 |  |  | $ | 195,808 |
Restricted cash and cash equivalents |  |  | 97,455 |  |  |  | 91,962 |
Total Cash and cash equivalents and restricted cash and cash equivalents |  | $ | 298,961 |  |  | $ | 287,770 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
Southern California Public Power Authority (“SCPPA”) |  |  | 24.7 | % |  |  | 26.7 | %
Sierra Pacific Power Company and Nevada Power Company |  |  | 16.8 |  |  |  | 18.9 |
Kenya Power and Lighting Co. Ltd. ("KPLC") |  |  | 12.2 |  |  |  | 14.5 |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
|  | (Dollars in thousands) |
Beginning balance of the allowance for expected credit losses |  | $ | 90 |  |  | $ | 90 |
Change in the provision for expected credit losses for the period |  |  | 73 |  |  |  | — |
Ending balance of the allowance for expected credit losses |  | $ | 163 |  |  | $ | 90 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
|  | (Dollars in thousands) |
Contract assets (*) |  | $ | 23,616 |  |  | $ | 18,367 |
Contract liabilities (*) |  | $ | (21,376 | ) |  | $ | (18,669 | )
Operating Lease, Lease Income [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
|  | (Dollars in thousands) |
Lease income relating to lease payments from operating leases |  | $ | 147,101 |  |  | $ | 137,621 |

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