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Note 12 - Federal and State Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal income tax at statutory rate, amount									$ 4,916	$ 2,124	$ 6,582
Federal income tax at statutory rate, percent									21.00%	21.00%	21.00%
Nondeductible per diem and meals, amount									$ 321	$ 0	$ 0
Nondeductible per diem and meals, percent									1.40%	0.00%	0.00%
Other nondeductible expenses, net, amount									$ 0	$ 342	$ 80
Other nondeductible expenses, net, percent									0.00%	3.40%	0.20%
State income taxes/other, net, amount									$ 345	$ (251)	$ 685
State income taxes/other, net, percent									1.50%	(2.50%)	2.20%
Total federal & state income tax expense	$ 4,713	$ 1,769	$ (402)	$ (498)	$ (4,168)	$ 1,264	$ 2,301	$ 2,818	$ 5,582	$ 2,215	$ 7,347
Total income tax (benefit) expense, percent									23.90%	21.90%	23.40%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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