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Note 4 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage | 76.00% | 78.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Non-US [Member] |  |
Concentration Risk, Percentage | 38.00% | 41.00%
Minimum [Member] |  |
Warranty Period (Year) | 1 year |
Contract with Customer, Payment Term (Day) | 30 days |
Maximum [Member] |  |
Warranty Period (Year) | 3 years |
Extended Service Warranty, Term (Year) | 4 years |
Contract with Customer, Payment Term (Day) | 60 days |
Grant [Member] |  |
Revenues, Total | $ 1.1 | $ 3.9

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