Note 4 - Acquisition - Unaudited Pro Forma Consolidated Income Statement Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net service revenues	$ 1,433,474	$ 1,427,474	$ 1,363,545
Operating income from continuing operations	139,646	140,291	129,103
Net income from continuing operations	$ 96,894	$ 104,334	$ 90,340
Basic income per share (in dollars per share)	$ 5.37	$ 6.14	$ 5.65
Diluted income per share (in dollars per share)	$ 5.27	$ 6	$ 5.54