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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% |  |  |  |

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