Note 16 - Paycheck Protection Program Loan (Details Textual)	3 Months Ended
Oct. 31, 2021 USD ($)
Paycheck Protection Program CARES Act [Member]
Debt Instrument, Decrease, Forgiveness	$ 2,331,365

Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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