Note 17 - Related Party Transactions (Details Textual) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Director [Member] \| Vegetables Supply [Member]
Related Party Transaction, Amounts of Transaction	$ 2.9	$ 2.2
Related Party Foudation [Member] \| Charitable Contributions [Member]
Related Party Transaction, Amounts of Transaction	1.0	$ 1.0
Beneficiaries of Former Employees That Have Family Relationships to Two of Current Directors [Member] \| Retirement Arrangements [Member]
Due to Related Parties, Total	$ 1.9

Carrying amount as of the balance sheet date of obligations due all related parties.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details