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Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 0	$ 19	$ 40
Effective Income Tax Rate Reconciliation, Foreign-derived Intangible Income Deduction Based on Updated Treasury Regulations, Amount	$ 630
Effective Income Tax Rate Reconciliation, Foreign-derived Intangible Income Deduction, Percentage	6.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 64
State and Local Jurisdiction [Member]
Open Tax Year	2018 2019 2020
Operating Loss Carryforwards, Total	$ 11,449
Domestic Tax Authority [Member]
Open Tax Year	2017 2018 2019 2020
Operating Loss Carryforwards, Total	$ 11,936
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 153
Foreign Tax Authority [Member]
Open Tax Year	2017 2018 2019 2020
Operating Loss Carryforwards, Total	$ 27,547
Tax Credit Carryforward, Amount	16
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Undistributed Earnings of Foreign Subsidiaries	$ 9,951	$ 12,900

X

- Definition

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 foreign-derived intangible income deduction based on updated treasury regulations.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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