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Note 9 - Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Fiscal Year: |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 20,850 |  |  | $ | 5,819 |  |  | $ | 3,454 |
State |  |  | 4,364 |  |  |  | 2,277 |  |  |  | 3,107 |
Total |  |  | 25,214 |  |  |  | 8,096 |  |  |  | 6,561 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | (5,010 | ) |  | $ | (3,886 | ) |  | $ | 7,084 |
State |  |  | (523 | ) |  |  | 352 |  |  |  | 50 |
Total |  |  | (5,533 | ) |  |  | (3,534 | ) |  |  | 7,134 |
Total income taxes |  | $ | 19,681 |  |  | $ | 4,562 |  |  | $ | 13,695 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Fiscal Year: |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Computed (expected tax rate) |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | %
State income taxes (net of federal tax benefit) |  |  | 3.6 | % |  |  | 4.1 | % |  |  | 3.7 | %
Federal credits |  |  | -0.6 | % |  |  | -3.9 | % |  |  | -0.9 | %
State rate changes |  |  | -0.2 | % |  |  | 2.8 | % |  |  | 0.3 | %
State credit expiration |  |  | 0.0 | % |  |  | 2.1 | % |  |  | 0.9 | %
Change in valuation allowance |  |  | 0.0 | % |  |  | 7.8 | % |  |  | -1.2 | %
Other |  |  | -0.1 | % |  |  | -0.8 | % |  |  | -0.9 | %
Effective income tax rate |  |  | 23.7 | % |  |  | 33.1 | % |  |  | 22.9 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | As of: |
|  | March 31, |  |  | March 31, |
|  | 2024 |  |  | 2023 |
Deferred income tax assets: |  |  |  |  |  |  |  |
Future tax credits |  | $ | 4,884 |  |  | $ | 5,007 |
Inventory valuation |  |  | 9,951 |  |  |  | 8,364 |
Employee benefits |  |  | 2,739 |  |  |  | 2,335 |
Insurance |  |  | 922 |  |  |  | 471 |
State depreciation basis differences |  |  | 3,344 |  |  |  | 3,218 |
Operating leases |  |  | 190 |  |  |  | 942 |
Intangibles |  |  | 2,760 |  |  |  | 1,514 |
Pension and post-﻿retirement benefits |  |  | 8,734 |  |  |  | 7,117 |
Interest |  |  | 18 |  |  |  | 8 |
Deferred revenue |  |  | 260 |  |  |  | 296 |
Net operating loss and other tax attribute carryovers |  |  | 558 |  |  |  | 1,233 |
Other |  |  | 427 |  |  |  | 327 |
Total assets |  |  | 34,787 |  |  |  | 30,832 |
Valuation allowance - noncurrent |  |  | (4,884 | ) |  |  | (5,007 | )
Total deferred income tax assets, net |  |  | 29,903 |  |  |  | 25,825 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property basis and depreciation difference |  |  | 25,260 |  |  |  | 26,450 |
Inventory reserve |  |  | 3,091 |  |  |  | 2,101 |
Right-of-use assets |  |  | 3,971 |  |  |  | 7,045 |
Pension |  |  | 21,682 |  |  |  | 21,528 |
Other |  |  | 219 |  |  |  | 182 |
Total liabilities |  |  | 54,223 |  |  |  | 57,306 |
Deferred income tax liability, net |  | $ | (24,320 | ) |  | $ | (31,481 | )
Summary of Income Tax Contingencies [Table Text Block] |
|  | As of: |
|  | March 31, |  |  | March 31, |
|  | 2024 |  |  | 2023 |
Beginning balance |  | $ | 742 |  |  | $ | 655 |
Tax positions related to current year: |  |  |  |  |  |  |  |
Additions |  |  | 120 |  |  |  | 96 |
Tax positions related to prior years: |  |  |  |  |  |  |  |
Reductions |  |  | (19 | ) |  |  | - |
Lapses in statues of limitations |  |  | (13 | ) |  |  | (9 | )
Ending balance |  | $ | 830 |  |  | $ | 742 |

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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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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized 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 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: 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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