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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Effective Income Tax Rate Reconciliation, Percent, Total | 23.00% | 21.20%
Effective Income Tax Rate Continuing Operations Change | (2.80%) |
Effective Income Tax Rate Reconciliation, Tax Law Change, Percent |  | (2.80%)
Effective Income Tax Rate Reconciliation, Tax Credit, Federal, Percent | (0.50%) |
Deferred Income Tax Liabilities, Net | $ 32,944 | $ 28,306
Tax Credit Carryforward, Valuation Allowance | 3,900 |
Unrecognized Tax Benefits, Uncertainty on Timing | 700 | 400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  | $ (200)
Effective Income Tax Rate Reconciliation, Lapses of Applicable Statute of Limitations, Amount | 100 |
California Franchise Tax Board [Member] |  |
Tax Credit Carryforward, Amount | 1,500 |
New York State Division of Taxation and Finance [Member] |  |
Tax Credit Carryforward, Amount | 1,300 |
Wisconsin Department of Revenue [Member] |  |
Tax Credit Carryforward, Amount | $ 2,400 |

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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 federal tax credit. + References No definition available. + Details
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- Definition Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax law change. + References No definition available. + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=123427490&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123427490&loc=d3e31917-109318 + Details
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