Note 1 - Significant Accounting Policies and Related Matters - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income	$ 44,038	$ 30,105	$ 20,636
Basic (in shares)	22,452,000	22,217,000	21,975,000
Basic (in dollars per share)	$ 1.96	$ 1.36	$ 0.94
Common stock equivalents, if dilutive (in shares)	327,000	206,000	196,000
Diluted (in shares)	22,779,000	22,423,000	22,171,000
Diluted (in dollars per share)	$ 1.93	$ 1.34	$ 0.93
Antidilutive securites (in shares)	1,453,445	294,580	293,053