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Note 5 - Derivative and Other Hedging Instruments (Details Textual) - Short [Member] $ in Millions | Dec. 31, 2025 USD ($) $ / item | Dec. 31, 2024 USD ($) $ / item
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Five Year Treasury Note Futures [Member] |  |
Derivative, Forward Price (in USD per Per Share) | $ / item | 109,300,000 | 106.3
Derivative, Fair Value, Net | $ | $ 133.9 | $ 332.2
Ten Year T-Note Futures [Member] |  |
Derivative, Forward Price (in USD per Per Share) | $ / item | 112,440,000 | 108.75
Derivative, Fair Value, Net | $ | $ 101.2 | $ 101.7
Ten Year Ultra Futures [Member] |  |
Derivative, Forward Price (in USD per Per Share) | $ / item | 115,020,000.00 | 111.31
Derivative, Fair Value, Net | $ | $ 69.0 | $ 36.2

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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- Definition The forward price on the price risk forward or futures contract, such as a gas futures contract. + References No definition available. + Details
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