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Note 6 - Long-term Debt (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | May 28, 2020
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval | $ 50,000 |
Dividends, Preferred Stock, Cash | 23,000 |
Pledged Assets Not Separately Reported, Fixed Assets | 508,200,000 |
Term Loan Payable to Farm Credit East ACA [Member] |  |
Debt Instrument, Face Amount |  | $ 100,000,000.0
Debt Instrument, Periodic Payment, Principal | 1,000,000.0 |
Debt Instrument, Unamortized Discount, Total |  | $ 200,000
Term Loan [Member] |  |
Debt Agreements, Financial Covenants, Minimum EBITDA | $ 50,000,000 |
Revolving Credit Facility [Member] |  |
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 | $ 25,000,000 |

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- Definition Represents the maximum percentage of commitments for available line of credit that requires minimum fixed charge coverage ratio. + 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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