Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	9 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Investment Company, Contractual Fee Waived	$ 110	$ 80
Other Commitment	$ 0

Amount of fee contractually waived by investment company.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Name:	us-gaap_InvestmentCompanyContractualFeeWaived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration