Note 8 - Earnings Per Share - Net Income Per Share Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Net income	$ 6,175	$ 6,359	$ 7,273	$ 6,964	$ 12,534	$ 14,236
Allocation of distributed and undistributed income to unvested restricted stock shareholders	(1)		(4)		(2)	(7)
Net income attributable to common shareholders	$ 6,174		$ 7,269		$ 12,532	$ 14,229
Weighted average common shares outstanding – basic (in shares)	23,871		24,578		23,870	24,582
Net income per share – basic (in dollars per share)	$ 0.26		$ 0.3		$ 0.53	$ 0.58
Net income attributable to common shareholders for basic computation	$ 6,174		$ 7,269		$ 12,532	$ 14,229
Weighted average effect of dilutive securities – stock options (in shares)	44		138		64	145
Denominator for diluted earnings per share – adjusted weighted average shares (in shares)	23,915		24,716		23,934	24,727
Net income per share – diluted (in dollars per share)	$ 0.26		$ 0.29		$ 0.52	$ 0.58