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Note 2 - Income Per Share - Calculation of Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Numerators:    
Income from continuing operations $ 22,167 $ 8,581
Income from discontinued operations 0 2,559
Net income $ 22,167 $ 11,140
Denominator:    
Denominator for basic income per share – weighted-average shares (in shares) 16,602 16,954
Effect of dilutive securities:    
Diluted weighted average shares outstanding (in shares) 16,769 17,086
Basic income per share:    
Income from continuing operations (in dollars per share) $ 1.34 $ 0.51
Income from discontinued operations (in dollars per share) 0 0.15
Net income (in dollars per share) [1] 1.34 0.66
Diluted income per share:    
Income from continuing operations (in dollars per share) 1.32 0.50
Income from discontinued operations (in dollars per share) 0 0.15
Net income (in dollars per share) [1] $ 1.32 $ 0.65
Restricted Stock [Member]    
Effect of dilutive securities:    
Equivalent shares issuable upon conversion of unvested shares (in shares) 167 132
Share-Based Payment Arrangement, Option [Member]    
Effect of dilutive securities:    
Equivalent shares issuable upon conversion of unvested shares (in shares) 0 0
[1] Sum of the individual amounts may not add due to rounding.