Note 5 - Fair Value (Details Textual) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Impaired Financing Receivable, Related Allowance	$ 3		$ 4
Other Real Estate Owned, Fair Value Disclosure	0	$ 0
Fair Value, Nonrecurring [Member] \| Impaired Loans [Member]
Impaired Financing Receivable, Related Allowance	0	0
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total	$ 0	$ 0

Amount of allowance for credit losses related to recorded investment.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant