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Note 1 - General and Basis of Presentation - Customers as a Percentage of Total Revenues (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member] | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Southern California Public Power Authority [Member] |  |
Percent of revenues | 24.70% | 26.70%
Sierra Pacific Power Company And Nevada Power Company [Member] |  |
Percent of revenues | 16.80% | 18.90%
Kenya Power and Lighting Co LTD [Member] |  |
Percent of revenues | 12.20% | 14.50%

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