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Note 11 - Income Taxes (Details Textual) - USD ($)		12 Months Ended
	Dec. 22, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%		30.80%
Taxes Payable, Total			$ 220,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			(279,000)
Tax Adjustments, Settlements, and Unusual Provisions			(59,000)
Unrecognized Tax Benefits, Ending Balance			827,000	$ 331,000	$ 221,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total			24,000	$ 17,000	$ 3,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total			272,000
Tax Credit Carryforward, Amount			100,000
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Undistributed Earnings of Foreign Subsidiaries			3,724,450
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total			0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total			$ 0
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%

X

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

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