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Note 5 - Earnings Per Share - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Net earnings	$ 22,250			$ 8,080			$ 66,985	$ 42,760
Undistributed earnings	21,382			7,240			64,386	40,189
Common Class A [Member]
Net earnings	3,556			1,297			10,730	6,872
Less dividends declared	127	$ 127	$ 127	125	$ 127	$ 129	381	381
Undistributed earnings	$ 3,429			$ 1,172			$ 10,349	$ 6,491
Class A - basic and diluted (in shares)	2,115			2,116			2,115	2,126
Net earnings per common share - basic and diluted (in dollars per share)	$ 1.68			$ 0.61			$ 5.07	$ 3.23
Common Class B [Member]
Net earnings	$ 18,694			$ 6,783			$ 56,255	$ 35,888
Less dividends declared	741	$ 740	$ 737	715	$ 725	$ 747	2,218	2,190
Undistributed earnings	$ 17,953			$ 6,068			$ 54,037	$ 33,698
Class A - basic and diluted (in shares)	10,548			10,434			10,519	10,512
Net earnings per common share - basic and diluted (in dollars per share)	$ 1.77			$ 0.65			$ 5.35	$ 3.41

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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