Note 4 - Loans (Details Textual) Pure in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Interest Receivable	$ 1,561		$ 1,561			$ 1,214
Financing Receivable, Nonaccrual	45		$ 45			431
Financing Receivable, Troubled Debt Restructuring					$ 354	318
Financing Receivable, Modifications, Number of Contracts			0
Financing Receivable, Modified, Increase (Decrease) from Modification	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0	0	0
Threshold Amount of Loans Outstanding to Perform Credit Analysis	$ 100		$ 100
Financing Receivable, Modifications, Number of Contracts	0	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Nonaccrual	$ 27		27			27
Financial Asset, Not Past Due [Member]
Financing Receivable, Nonaccrual	$ 18		$ 18			$ 404