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Note 9 - Income Taxes - Reconciliation of Income Tax Rate (Details) | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2015
Computed (expected tax rate) | 21.00% | 21.00% | 21.00% | 35.00%
State income taxes (net of federal tax benefit) | 3.80% | 3.70% | 3.10% |
Federal credits | 1.20% | 0.80% | 0.30% |
State rate changes | 0.80% | 0.30% | 0.00% |
State credit expiration | 0.60% | 0.90% | 0.00% |
Change in valuation allowance | 2.30% | (1.10%) | 0.20% |
Federal return to accrual | 0.10% | 0.90% | (0.00%) |
State return to accrual | 0.20% | (0.10%) | (0.00%) |
Federal net operating loss (NOL) carryback rate difference | 0.00% | 0.00% | (2.80%) |
Interest received on federal NOL carryback | 0.00% | (0.30%) | (0.20%) |
Uncertain tax benefits return to accrual | 0.10% | (0.30%) | (0.00%) |
Other | 0.10% | (0.20%) | 0.20% |
Effective income tax rate | 27.00% | 23.00% | 21.20% |

X
- Definition Percentage 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 federal return to accrual. + References No definition available. + Details
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- Definition Percentage 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 interest received on federal NOL carryback. + References No definition available. + Details
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- Definition Represents the effective income tax reconciliation net operating loss carryback rate difference. + References No definition available. + Details
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- Definition Percentage 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 state credit expiration. + References No definition available. + Details
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- Definition Percentage 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 state return to accrual. + References No definition available. + Details
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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by federal tax credits, generated or utilized under enacted tax laws during the period. + References No definition available. + Details
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- Definition Percentage 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 uncertain tax benefits return to accrual. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Percentage 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 changes in the valuation allowance for deferred tax assets. + 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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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