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Note 4 - Significant Transactions (Details Textual) - USD ($) $ in Thousands | Nov. 17, 2022 | Oct. 20, 2021 | Mar. 31, 2023 | Oct. 20, 2022 | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Goodwill, Ending Balance |  |  | $ 286,444 |  | $ 291,166 | $ 160,841
Belyntic Acquisition [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 4,950 |  |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 1,500 |  |  |  |  |
Agena [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 300,793 |  |  |  |
Payments to Acquire Businesses, Settlement of Options |  | 31,800 |  |  |  |
Goodwill, Ending Balance |  | 135,728 |  | $ 135,728 |  |
Agena [Member] | Agena Warrants [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 2,000 |  |  |  |
Agena [Member] | Holders of Agena Preferred and Common Stock [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 267,000 |  |  |  |

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