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Note 6 - Stockholders' Equity - Schedule of Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Balance Beginning | $ 2,073,967 | $ 2,039,514 | $ 1,958,630 | $ 1,968,104
Balance Ending | 2,310,033 | 2,073,967 | 1,980,065 | 1,958,630
Changes in fair value of derivative contracts designated as hedge transactions |  |  |  |
Balance Beginning | 8,428 | 5,994 | 8,305 | 13,708
Changes in fair value of derivative contracts | 5,748 | 2,787 | (4,545) | (3,971)
Gains and deferred gains transferred from accumulated other comprehensive income | (2,495) | (353) | (1,943) | (1,432)
Balance Ending | 11,681 | 8,428 | 1,817 | 8,305
Adjustments For Pension Plans |  |  |  |
Balance Beginning | (16,260) | (16,260) | (7,871) | (7,871)
Changes in fair value of derivative contracts | 0 | 0 | 0 | 0
Gains and deferred gains transferred from accumulated other comprehensive income | 0 | 0 | 0 | 0
Balance Ending | (16,260) | (16,260) | (7,871) | (7,871)
Accumulated Distributions in Excess of Net Income |  |  |  |
Balance Beginning | (7,832) | (10,266) | 434 | 5,837
Changes in fair value of derivative contracts | 5,748 | 2,787 | (4,545) | (3,971)
Gains and deferred gains transferred from accumulated other comprehensive income | (2,495) | (353) | (1,943) | (1,432)
Balance Ending | $ (4,579) | $ (7,832) | $ (6,054) | $ 434

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- Definition Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References No definition available. + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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