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Note 8 - Income Taxes (Details Textual) - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ 2,100,000		$ 1,814,000		$ 6,576,000	$ 5,925,000
Effective Income Tax Rate Reconciliation, Percent, Total	21.60%		21.00%		21.70%	23.90%
Proceeds from Income Tax Refunds					$ 285,000		$ 194,000	$ 93,000
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount		$ 106,000		$ 322,000

X

- Definition

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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