Employee Benefit Plans, Allocation of Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Allocation of Plan Assets [Abstract]
Total plan assets	$ 5,759	$ 5,214	$ 5,139
Weighted-average plan asset allocation	100.00%	100.00%
Cash and Cash Equivalents [Member]
Allocation of Plan Assets [Abstract]
Total plan assets	$ 57	$ 0
Weighted-average plan asset allocation	1.00%	0.00%
Mutual Funds - Balanced [Member]
Allocation of Plan Assets [Abstract]
Total plan assets	$ 1,035	$ 902
Weighted-average plan asset allocation	18.00%	17.30%
Mutual Funds - Balanced [Member] | Maximum [Member]
Allocation of Plan Assets [Abstract]
Allowable variation	5.00%
Mutual Funds - Fixed Income [Member]
Allocation of Plan Assets [Abstract]
Total plan assets	$ 2,983	$ 2,809
Weighted-average plan asset allocation	51.80%	53.90%
Mutual Funds - Equity [Member]
Allocation of Plan Assets [Abstract]
Total plan assets	$ 1,684	$ 1,503
Weighted-average plan asset allocation	29.20%	28.80%
Short-term and Intermediate-term Fixed Income Bond Funds [Member]
Allocation of Plan Assets [Abstract]
Target allocation for investment in mutual funds	60.00%
Large Cap Value Funds [Member]
Allocation of Plan Assets [Abstract]
Target allocation for investment in mutual funds	40.00%