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Note 2 - Significant Transactions (Details Textual) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Oct. 20, 2021		Sep. 30, 2022	Sep. 30, 2022	Mar. 31, 2022
Goodwill, Ending Balance			$ 278,006	$ 278,006	$ 291,166
Agena [Member]
Payments to Acquire Businesses, Gross	$ 300,793
Payments to Acquire Businesses, Settlement of Options	31,800
Goodwill, Ending Balance	136,260	[1]			$ 136,260
Agena [Member] | Acquisition-related Costs [Member]
Business Combination, Acquisition Related Costs			$ 267	$ 623
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
[1] Acquired goodwill of $140,022, all of which is allocated to the Clinical Genomics reportable segment, represents the value expected to arise from the value of expanded market opportunities, expected synergies, and assembled workforce, none of which qualify as amortizable intangible assets. The goodwill acquired is not deductible for income tax purposes.

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