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Note 6 - Debt (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 23, 2024 | May 23, 2023 | Jan. 20, 2023 | Sep. 28, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member] |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | $ 37,225,000 | $ 36,637,000 | $ 70,628,000
Total finance obligation |  |  |  |  | 369,878,000 | 604,786,000 |
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval |  |  |  |  | 50,000 |  |
Dividends, Preferred Stock, Cash |  |  |  |  | 23,181 | 23,000 | 23,000
Pledged Assets Not Separately Reported, Fixed Assets |  |  |  |  | 804,000,000 |  |
Long-Term Line of Credit |  |  |  |  | 1,000,000 | 237,225,000 |
Term Loan A-1 [Member] |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  | $ 1,000,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.3012% |  |  |  |
Debt Instrument, Face Amount |  |  | $ 100,000,000 |  |  |  |
Debt Instrument, Maturity Date |  |  | Jun. 01, 2025 |  |  |  |
Total finance obligation |  |  |  |  | 80,995,000 | 84,963,000 |
Term Loan A-2 [Member] |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  | $ 1,500,000 |  |  |  |
Debt Instrument, Maturity Date |  |  | Jan. 20, 2028 |  |  |  |
Total finance obligation |  | $ 173,500,000 | $ 175,000,000 |  | $ 267,827,000 | 282,598,000 |
Second Amended and Restated Loan and Guaranty Agreement Amendment One with Farm Credit East, ACA [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 125,000,000 |  |  |  |  |
Amended Term Loan A-2 [Member] |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | 3,750,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.57% |  |
Total finance obligation |  | $ 298,500,000 |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | $ 1,100,000 |  |
Term Loan [Member] |  |  |  |  |  |  |
Proceeds from Patronage Distributions |  |  |  |  | 4,200,000 | 3,700,000 | $ 900,000
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 450,000,000 |  |
Line of Credit Facility, Maximum Borrowing Capacity During Nonproduction Period |  |  |  |  | 400,000,000 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | $ 442,000,000 |  |
Debt Issuance Costs, Line of Credit Arrangements, Net | $ 1,600,000 |  |  |  |  |  |
Repayments of Lines of Credit | $ 70,000,000 |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Percentage of Commitments for Available Line of Credit that Requires Minimum Fixed Charge Coverage Ratio |  |  |  |  | 10.00% |  |
Debt Instrument, Covenant, Maximum Amount for Available Line of Credit that Requires Minimum Fixed Charge Coverage Ratio |  |  |  |  | $ 30,000,000 |  |
Debt Agreements, Financial Covenants, Minimum EBITDA |  |  |  |  | 75,000,000 |  |
Long-Term Line of Credit |  |  |  |  | 1,000,000 | $ 237,225,000 |
Standby Letters of Credit [Member] |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  | 7,000,000 |  |
Unsecured Note Payable [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 1.80% |
Can Manufacturing Finance Obligation [Member] |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  | $ 21,300,000 |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 300,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.56% |  |

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