Note 8 - Earnings Per Share - Net Income Per Share Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net income	$ 6,359	$ 6,964
Allocation of distributed and undistributed income to unvested restricted stock shareholders	(1)	(4)
Net income attributable to common shareholders	$ 6,358	$ 6,960
Weighted average shares of common stock outstanding – basic (in shares)	23,868	24,585
Net income per share – basic (in dollars per share)	$ 0.27	$ 0.28
Net income attributable to common shareholders for basic computation	$ 6,358	$ 6,960
Weighted average effect of dilutive securities – stock options (in shares)	95	153
Denominator for diluted earnings per share – adjusted weighted average shares (in shares)	23,963	24,738
Net income per share – diluted (in dollars per share)	$ 0.27	$ 0.28