Note 10 - Loan and Credit Agreements - Summary of Term Debt (Details) (Parentheticals) - USD ($)	6 Months Ended	12 Months Ended
May 31, 2019	Nov. 30, 2018
Term Loan Due October 2037 [Member]
Debt instrument, periodic payment	$ 17,271	$ 17,271
Debt instrument, interest rate, stated percentage	5.00%	5.00%
Iowa Finance Authority Term Loan [Member]
Debt instrument, periodic payment	$ 12,500	$ 12,500
Debt instrument, interest rate, stated percentage	2.75%	2.75%

Amount of the required periodic payments including both interest and principal payments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration