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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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Net earnings $ 5,573 $ (3,804) $ 2,967 $ 1,131 $ 1,769 $ 4,098
Undistributed earnings 4,737   2,132   94 2,425
Common Class A [Member]            
Net earnings 923   494   274 673
Less dividends declared 129 130 131 130 259 261
Undistributed earnings $ 794   $ 363   $ 15 $ 412
Weighted-average shares outstanding, basic and diluted (in shares) 2,145   2,175   2,145 2,175
Common shares - basic and diluted (in dollars per share) $ 0.43   $ 0.23   $ 0.13 $ 0.31
Common Class B [Member]            
Net earnings $ 4,650   $ 2,473   $ 1,495 $ 3,425
Less dividends declared 707 $ 709 704 $ 708 1,416 1,412
Undistributed earnings $ 3,943   $ 1,769   $ 79 $ 2,013
Weighted-average shares outstanding, basic and diluted (in shares) 10,178   10,112   10,151 10,100
Common shares - basic and diluted (in dollars per share) $ 0.46   $ 0.24   $ 0.15 $ 0.34