Note 4 - Property, Plant and Equipment (Details Textual) - USD ($)	6 Months Ended
Nov. 30, 2023	Nov. 30, 2022
Depreciation Expense, Including Amortization Related to Financing Leases	$ 2,828,552	$ 2,719,312
Machinery and Equipment [Member]
Deposit Assets	$ 609,707

The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Name:	us-gaap_DepositAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant