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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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