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Note 14 - Earnings Per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 13,953 $ 6,000 $ (823) $ (1,304) $ (13,636) $ 4,581 $ 8,654 $ 8,301 $ 17,827 $ 7,900 $ 23,994
Basic (in shares) 5,734 5,763 5,766 5,746 5,751 5,756 5,901 5,921 5,752 5,832 6,083
Dilutive effect of common stock equivalents (in shares)                 16 48 76
Diluted weighted average common shares outstanding (in shares) 5,752 5,768 5,766 5,746 5,751 5,799 5,949 5,985 5,768 5,880 6,159
Basic (in dollars per share) $ 2.43 $ 1.04 $ (0.14) $ (0.23) $ (2.37) $ 0.80 $ 1.47 $ 1.40 $ 3.10 $ 1.35 $ 3.94
Diluted (in dollars per share) $ 2.43 $ 1.04 $ (0.14) $ (0.23) $ (2.37) $ 0.79 $ 1.45 $ 1.39 $ 3.09 $ 1.34 $ 3.90