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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Nov. 17, 2022 USD ($) | Aug. 12, 2019
Belyntic Acquisition [Member] | Other Long-term Liabilities [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Noncurrent | $ 1,180 |  | $ 1,500 |
Senior Notes [Member] | The Notes [Member] |  |  |  |
Long-term Debt, Gross | $ 172,500 | $ 172,500 |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% |  |  | 1.375%
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Number of Major Customers | 0 |  |  |

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