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Note 5 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			31.50%
Income Tax Expense Reduction (Increase) Due to Blended Rate			$ 1,900,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			(430,000)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	$ 322,000	$ (176,000)	(1,086,000)
Tax Adjustments, Settlements, and Unusual Provisions	(93,000)	$ 8,000	$ (150,000)
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 0

X

- Definition

Amount of reduction (increase) to income tax expense due to the blended rate.

+ References

No definition available.

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

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-SubTopic 10
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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 income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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