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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current | $ 39,000 | $ 59,000 |
Inventory Valuation Reserves, Ending Balance | 86,000 | 45,000 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | $ 0 | $ 0 | $ 0
Supplier Concentration Risk [Member] | Cost of Goods and Service Benchmark [Member] |  |  |
Number of Suppliers | 5 | 3 |
Concentration Risk, Percentage | 80.00% | 60.00% |
Building [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 30 years |  |
Furniture, Fixtures, Equipment and Computer Software [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Furniture, Fixtures, Equipment and Computer Software [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |  |

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