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Note 2 - Income Per Share - Calculation of Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Numerators:    
Income from continuing operations $ 16,485 $ 22,167
Income from discontinued operations 150 0
Net income $ 16,635 $ 22,167
Denominator:    
Denominator for basic income per share – weighted-average shares (in shares) 13,361,000 16,602,000
Effect of dilutive securities:    
Diluted weighted average shares outstanding (in shares) 13,877,000 16,769,000
Basic income per share:    
Income from continuing operations (in dollars per share) $ 1.23 $ 1.34
Income from discontinued operations (in dollars per share) 0.01 0
Net income(1) (in dollars per share) [1] 1.25 1.34
Diluted income per share:    
Income from continuing operations (in dollars per share) 1.19 1.32
Income from discontinued operations (in dollars per share) 0.01 0
Net income (in dollars per share) [1] $ 1.20 $ 1.32
Restricted Stock [Member]    
Effect of dilutive securities:    
Equivalent shares issuable upon conversion of unvested shares (in shares) 288,000 167,000
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) 288,000 167,000
Share-Based Payment Arrangement, Option [Member]    
Effect of dilutive securities:    
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) 228,000 0
[1] Sum of the individual amounts may not add due to rounding.