Note 10 - Related Party Transactions - Notes Payable (Details) (Parentheticals)	3 Months Ended	12 Months Ended
Sep. 30, 2021	Jun. 30, 2021
Notes Payable Due on December 31, 2012 [Member]
Notes payable, interest rate	8.00%	8.00%
Notes payable, maturity date	Dec. 31, 2012	Dec. 31, 2012
Notes Payable Due on May 25, 2022 [Member]
Notes payable, interest rate	4.00%	4.00%
Notes payable, maturity date	May 25, 2022	May 25, 2022
Notes Payable Due on April 8, 2022 [Member]
Notes payable, interest rate	4.00%	4.00%
Notes payable, maturity date	Apr. 08, 2022	Apr. 08, 2022

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration