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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 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Net earnings $ 16,548 $ 17,038 $ 5,064 $ 5,734 $ 7,880 $ 3,199 $ 38,649 $ 16,813
Undistributed earnings 15,696     4,886     36,087 14,278
Common Class A [Member]                
Net earnings 2,715     940     6,327 2,761
Less dividends declared 128 129 129 129 129 128 386 386
Undistributed earnings $ 2,587     $ 811     $ 5,941 $ 2,375
Class A - basic and diluted (in shares) 2,142     2,145     2,144 2,145
Class A common share - basic and diluted (in dollars per share) $ 1.27     $ 0.44     $ 2.95 $ 1.29
Common Class B [Member]                
Net earnings $ 13,833     $ 4,794     $ 32,322 $ 14,052
Less dividends declared 724 $ 726 $ 727 719 $ 714 $ 716 2,176 2,149
Undistributed earnings $ 13,109     $ 4,075     $ 30,146 $ 11,903
Class A - basic and diluted (in shares) 10,340     10,269     10,358 10,237
Class A common share - basic and diluted (in dollars per share) $ 1.34     $ 0.47     $ 3.12 $ 1.37