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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2015
Effective Income Tax Rate Reconciliation, Percent | 27.00% | 23.00% | 21.20% |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 2.30% | (1.10%) | 0.20% |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 0.80% | 0.30% | 0.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation, Net Operating Loss Carryback Rate Difference |  |  | (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 | $ 31,625 | $ 32,944 |  |
Tax Credit Carryforward, Valuation Allowance | 5,000 |  |  |
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 | $ 2,200 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 0.60% |  |  |
Valuation Allowance Against State Tax Credits [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 3.50% |  |  |

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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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