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Note 14 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Net operating loss carryforwards | $ 163,674 | $ 171,274
Research and development and other tax credit carryforwards | 13,837 | 13,464
Capitalized research and development costs | 2,186 | 0
Accruals and reserves | 5,644 | 5,366
Fixed assets and intangible assets | 638 | 565
Other | 1,993 | 1,432
Gross deferred tax assets | 187,972 | 192,101
Valuation allowance | (183,567) | (186,618)
Total deferred tax assets | 4,405 | 5,483
Amortization | (2,011) | (2,721)
Other | (1,523) | (1,835)
Total deferred tax liabilities | (3,534) | (4,556)
Net deferred tax assets | $ 871 | $ 927

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