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Note 1 - Summary of Significant Accounting Policies - Calculation of Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income $ 1,162 $ (3,189) $ 6,071 $ 4,433 $ 16,501 $ 11,614 $ 9,971 $ 4,417 $ 8,477 $ 42,503 $ 55,439
Denominator:                      
Denominator for basic income per share – weighted-average shares (in shares)                 18,435 18,340 18,279
Effect of dilutive securities:                      
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)                 200 129 93
Diluted weighted average shares outstanding (in shares)                 18,635 18,469 18,372
Income per share:                      
Basic income per share (in dollars per share) $ 0.06 $ (0.17) $ 0.33 $ 0.24 $ 0.91 $ 0.63 $ 0.54 $ 0.24 $ 0.46 $ 2.32 $ 3.03
Diluted income per share (in dollars per share) $ 0.05 $ (0.17) $ 0.33 $ 0.24 $ 0.89 $ 0.63 $ 0.54 $ 0.24 $ 0.45 $ 2.30 $ 3.02
[1] Includes $40.1 million one-time benefit related to the Tax Act.