Note 10 - Income Taxes - Reconciliation of Statutory Federal Tax Rate (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
U.S. federal statutory tax rate, amount		$ 26,763	$ 20,864	$ 17,079
U.S. federal statutory tax rate, percent		21.00%	21.00%	21.00%
State and local taxes, net of federal income tax effect*, amount	[1]	$ 6,019	$ 5,469	$ 4,667
State and local taxes, net of federal income tax effect*, percent	[1]	4.70%	5.50%	5.70%
Work opportunity tax credits, net of federal taxable income add back, amount		$ (2,923)	$ (2,844)	$ (2,765)
Work opportunity tax credits, net of federal taxable income add back, percent		(2.30%)	(2.90%)	(3.40%)
Other credit programs, amount		$ (711)	$ (474)	$ (474)
Other credit programs, percent		(0.60%)	(0.40%)	(0.60%)
162(m) compensation, amount		$ 4,830	$ 1,992	$ 1,409
162(m) compensation, percent		3.80%	2.00%	1.70%
Excess tax benefit, amount		$ (2,433)	$ (408)	$ (320)
Excess tax benefit, percent		(1.90%)	(0.40%)	(0.40%)
Stock acquisition cost, amount		$ 0	$ 1,081	$ 4
Stock acquisition cost, percent		0.00%	1.10%	0.10%
Other nondeductible items, amount		$ 181	$ 130	$ 176
Other nondeductible items, percent		0.20%	0.10%	0.20%
Federal RTP, amount		$ (191)	$ (55)	$ (966)
Federal RTP, percent		(0.20%)	(0.10%)	(1.20%)
Effective income tax rate, amount		$ 31,535	$ 25,755	$ 18,810
Effective income tax rate, percent		24.70%	25.90%	23.10%

[1] State taxes in Illinois for 2025, 2024, and 2023 made up the majority (greater than 50 percent) of the tax effect within this category.