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Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Net operating loss carryforwards	$ 155,714	$ 163,674
Research and development and other tax credit carryforwards	12,790	13,837
Capitalized research and development costs	3,514	2,186
Accruals and reserves	6,522	5,644
Fixed assets and intangible assets	639	638
Other	1,665	1,993
Gross deferred tax assets	180,844	187,972
Valuation allowance	(177,112)	(183,567)
Total deferred tax assets	3,732	4,405
Amortization	(1,492)	(2,011)
Other	(1,421)	(1,523)
Total deferred tax liabilities	(2,913)	(3,534)
Net deferred tax assets	$ 819	$ 871

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