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Note 1 - Significant Accounting Policies - Calculation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
 [2]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net income $ 49,298 $ 4,632 $ 1,548 $ (39) $ 5,982 $ 2,869 $ 3,632 $ 4,352 $ 55,439 $ 16,835 $ 42,085
Denominator:                      
Denominator for basic income per share – weighted-average shares (in shares)                 18,279 18,182 18,145
Effect of dilutive securities:                      
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)                 93 84 161
Equivalent shares issuable upon conversion of unvested employee stock options (in shares)                 5
Denominator for diluted income per share adjusted weighted-average shares and assumed conversions (in shares)                 18,372 18,266 18,311
Income per share:                      
Basic income per share (in dollars per share) $ 2.70 $ 0.25 $ 0.08 $ 0 $ 0.33 $ 0.16 $ 0.20 $ 0.21 $ 3.03 $ 0.93 $ 2.32
Diluted income per share (in dollars per share) $ 2.69 $ 0.25 $ 0.08 $ 0 $ 0.33 $ 0.16 $ 0.20 $ 0.21 $ 3.02 $ 0.92 $ 2.30
[1] Includes $40.1m one-time benefit related to the Tax Cuts and Jobs Act.
[2] Adjusted from 10-Q as filed due to implementation of ASU 2016-09.