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Note 10 - Income Taxes - A Reconciliation of the Provision for Income Taxes (Details) - USD ($)	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
Expense computed at the statutory federal tax rate									$ 2,680,000	$ 3,339,000
State and local taxes, net of federal income tax effect									720,000	892,000
Other, net									(3,000)	(6,000)
Valuation allowance for deferred tax assets	$ 200,000				$ 0				200,000	0
Income tax expense	$ 1,189,000	$ 713,000	$ 845,000	$ 850,000	$ 1,234,000	$ 1,417,000	$ 293,000	$ 1,281,000	$ 3,597,000	$ 4,225,000
Effective income tax rate									28.18%	26.57%

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 other adjustments.

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Amount 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 state and local income tax expense (benefit).

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