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Note 12 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Federal income taxes at statutory rates | $ (82) | $ 751 | $ 483
State income taxes, net of federal benefit | (1,075) | 628 | (221)
Tax benefit of stock option exercises | (1,169) | (4,055) | (1,816)
Research and development credit | (1,010) | (495) | (165)
Limitation for 162(m) | 2,675 | 4,039 | 1,113
Return to provision adjustment | (125) | (68) | (172)
Subpart F, GILTI, & FDII | (127) | 6 | (999)
Foreign rate differential | (439) | 152 | 810
Permanent Difference | 33 | 64 | 15
Interest reserve adjustment | 0 | 668 |
Other | 0 | 13 | (19)
Total income tax (benefit) expense | $ (1,319) | $ 1,703 | $ (971)

X
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the limitation for 162(m). + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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