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Note 8 - Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2026
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  |  |  |  |  | Fiscal Year: |  |  |  |  |
|  | 2026 |  |  | 2025 |  |  | 2024 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 22,075 |  |  | $ | 9,236 |  |  | $ | 20,850 |
State |  |  | 4,225 |  |  |  | 1,833 |  |  |  | 4,364 |
Total |  |  | 26,300 |  |  |  | 11,069 |  |  |  | 25,214 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 5,712 |  |  | $ | 1,257 |  |  | $ | (5,010 | )
State |  |  | 2,409 |  |  |  | 933 |  |  |  | (523 | )
Total |  |  | 8,121 |  |  |  | 2,190 |  |  |  | (5,533 | )
Total income taxes |  | $ | 34,421 |  |  | $ | 13,259 |  |  | $ | 19,681 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Fiscal Year: |
|  | 2026 |
U.S. federal statutory rate |  | $ | 31,310 |  |  |  |  | 21.0 | %
State income taxes (net of federal tax benefit) (1) |  |  | 5,388 |  |  |  |  | 3.6 | %
Effect of cross border tax laws |  |  | (304 | ) |  |  |  | -0.2 | %
Tax credits |  |  | (416 | ) |  |  |  | -0.3 | %
Non-taxable or non-deductible items |  |  | (1,222 | ) |  |  |  | -0.8 | %
Changes in unrecognized tax benefits |  |  | (438 | ) |  |  |  | -0.3 | %
Other reconciling items |  |  | 103 |  |  |  |  | 0.1 | %
Total |  | $ | 34,421 |  |  |  |  | 23.1 | %
|  | Fiscal Year: |
|  | 2025 |  |  | 2024 |
U.S. federal statutory rate |  |  | 21.0 | % |  |  | 21.0 | %
State income taxes (net of federal tax benefit) |  |  | 3.9 | % |  |  | 3.6 | %
Federal credits |  |  | -0.8 | % |  |  | -0.6 | %
State rate changes |  |  | 0.0 | % |  |  | -0.2 | %
State credit expiration |  |  | 0.9 | % |  |  | 0.0 | %
State return to accrual |  |  | 1.4 | % |  |  | 0.5 | %
Change in valuation allowance |  |  | -2.1 | % |  |  | -0.2 | %
Other |  |  | 0.0 | % |  |  | -0.4 | %
Effective income tax rate |  |  | 24.3 | % |  |  | 23.7 | %
Schedule of Cash Paid for Income Taxes [Table Text Block] |
Federal |  | $ | 25,197 |
Illinois |  |  | 1,600 |
Other states |  |  | 3,465 |
Income taxes paid, net of amounts refunded |  | $ | 30,262 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | As of: |
|  | March 31, |  |  | March 31, |
|  | 2026 |  |  | 2025 |
Deferred income tax assets: |  |  |  |  |  |  |  |
Future tax credits |  | $ | 2,348 |  |  | $ | 3,719 |
Inventory valuation |  |  | 6,988 |  |  |  | 7,294 |
Employee benefits |  |  | 3,509 |  |  |  | 3,108 |
Insurance |  |  | 560 |  |  |  | 878 |
State depreciation basis differences |  |  | 2,896 |  |  |  | 3,152 |
Operating leases |  |  | 228 |  |  |  | 128 |
Intangibles |  |  | - |  |  |  | 2,994 |
Pension and post-retirement benefits |  |  | 13 |  |  |  | 2,877 |
Interest |  |  | 19 |  |  |  | 34 |
Business interest limitation |  |  | - |  |  |  | 3,194 |
Deferred revenue |  |  | 100 |  |  |  | 164 |
Net operating loss and other tax attribute carryovers |  |  | 132 |  |  |  | 278 |
Other |  |  | 326 |  |  |  | 467 |
Total assets |  |  | 17,119 |  |  |  | 28,287 |
Valuation allowance - noncurrent |  |  | (2,328 | ) |  |  | (3,719 | )
Total deferred income tax assets, net |  |  | 14,791 |  |  |  | 24,568 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property basis and depreciation difference |  |  | 29,853 |  |  |  | 27,537 |
Intangibles |  |  | 379 |  |  |  | - |
Inventory reserve |  |  | 6,558 |  |  |  | 5,200 |
Right-of-use assets |  |  | 705 |  |  |  | 2,236 |
Pension |  |  | 26,798 |  |  |  | 21,587 |
Other |  |  | 158 |  |  |  | 290 |
Total liabilities |  |  | 64,451 |  |  |  | 56,850 |
Deferred income tax liability, net |  | $ | (49,660 | ) |  | $ | (32,282 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | As of: |
|  | March 31, |  |  | March 31, |
|  | 2026 |  |  | 2025 |
Beginning balance |  | $ | 912 |  |  | $ | 830 |
Tax positions related to prior years: |  |  |  |  |  |  |  |
Additions |  |  | - |  |  |  | 82 |
Lapses in statues of limitations |  |  | (494 | ) |  |  | - |
Ending balance |  | $ | 418 |  |  | $ | 912 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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