Note 1 - Summary of Significant Accounting Policies - Calculation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 30, 2021
Numerators:
Income from continuing operations		$ 54,629	$ 107,932	$ 58,191
Income from discontinued operations, net of tax		600	750	2,540
Net income		$ 55,229	$ 108,682	$ 60,731	$ 60,731
Denominator:
Denominator for basic income per share – weighted-average shares (in shares)		13,048	15,006	16,803
Effect of dilutive securities:
Diluted weighted average shares outstanding (in shares)		13,834	15,524	17,020
Basic income per share:
Income from continuing operations (in dollars per share)		$ 4.19	$ 7.19	$ 3.46
Income from discontinued operations (in dollars per share)		0.05	0.05	0.15
Net income per basic share(1) (in dollars per share)	[1]	4.23	7.24	3.61
Diluted income per share:
Income from continuing operations (in dollars per share)		3.95	6.95	3.42
Income from discontinued operations (in dollars per share)		0.04	0.05	0.15
Net income per diluted share (in dollars per share)		$ 3.99	$ 7	$ 3.57
Restricted Stock [Member]
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)		245	358	217
Share-Based Payment Arrangement, Option [Member]
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)		541	160	0

[1] Total may not sum due to rounding.