Note 12 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended	20 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Aug. 21, 2020
Income tax expense at U.S. federal statutory rate	$ 1,230,000
Limited tax benefit due to stock-based compensation	(109,000)
Other	(6,000)
Income tax expense	$ 1,115,000		$ 0
Effective income tax rate	19.00%

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

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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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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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