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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, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member]
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | $ 44,323,000 | $ 37,225,000 | $ 36,637,000
Total finance obligation |  |  |  |  | 271,477,000 | 369,878,000 |
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 |  |  |  |  | 864,400,000 |  |
Long-Term Line of Credit |  |  |  |  | 1,000,000 | 1,000,000 |
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 |  |  |  |  | 0 | 80,995,000 |
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 |  | $ 253,056,000 | 267,827,000 |
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 |  |  |  |  | 5.42% |  |
Total finance obligation |  | $ 298,500,000 |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  | $ 1,100,000 |  |
Term Loan [Member] |  |  |  |  |  |  |
Proceeds from Patronage Distributions |  |  |  |  | $ 3,300,000 | 4,200,000 | $ 3,700,000
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 |  |  |  |  |  | 448,600,000 |
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 | 1,000,000 |
Standby Letters of Credit [Member] |  |  |  |  |  |  |
Long-Term Line of Credit |  |  |  |  | $ 400,000 |  |
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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- Definition Maximum borrowing capacity under the credit facility during the reporting entity's nonproduction period without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of fixed assets owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479359/835-30-S45-1 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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