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Note 4 - Earnings Per Share - Basic and Diluted Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net earnings $ 14,572 $ 5,064
Undistributed earnings 13,697 4,208
Common Class A [Member]    
Net earnings 2,331 821
Less dividends declared 128 129
Undistributed earnings $ 2,203 $ 692
Class A - basic and diluted (in shares) 2,142 2,145
Class A common share - basic and diluted (in dollars per share) $ 1.09 $ 0.38
Common Class B [Member]    
Net earnings $ 12,241 $ 4,243
Less dividends declared 747 727
Undistributed earnings $ 11,494 $ 3,516
Class A - basic and diluted (in shares) 10,639 10,374
Class A common share - basic and diluted (in dollars per share) $ 1.15 $ 0.41