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Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%	21.00%
Tax Adjustments, Settlements, and Unusual Provisions		$ (43)
Taxes Payable, Total		322
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		(279)
Unrecognized Tax Benefits, Ending Balance		1,361	$ 827	$ 331	$ 221
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total		$ 40	$ 24	$ 17
Domestic Tax Authority [Member]
Open Tax Year		2016 2017 2018 2019
Operating Loss Carryforwards, Total		$ 0
State and Local Jurisdiction [Member]
Open Tax Year		2015 2016 2017 2018 2019
Operating Loss Carryforwards, Total		$ 0
Foreign Tax Authority [Member]
Open Tax Year		2015 2016 2017 2018 2019
Operating Loss Carryforwards, Total		$ 90
Tax Credit Carryforward, Amount		16
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Undistributed Earnings of Foreign Subsidiaries		$ 5,414

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

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

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