Note 11 - Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Defined Contribution Plan, Employer Matching Contribution, Percent for First Compensation Slab	100.00%
Percentage of First Compensation	3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent for Next Compensation Slab	50.00%
Percentage of Next Compensation	2.00%
Defined Contribution Plan, Cost	$ 111,000	$ 99,000
Defined Contribution Plan, Employer Profit Sharing Contribution Amount	200,000	80,000
Defined Contribution Plan, Employer Matching Contribution, Amount	$ 14,000	$ 15,000
Employee Stock Purchase Plan [Member]
Treasury Stock, Shares, Purchased by Employees (in shares)	10,191	2,330
Employee Stock Purchase Plan, Employer Matching Contribution Amount	$ 38,000	$ 6,000