Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under 2015 Equity Incentive Plan	1,500,000		1,500,000
Non-cash share-based compensation expense	$ 462	$ 424	$ 915	$ 838
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted under 2015 Equity Incentive Plan	12,110	15,000	12,110	15,000
Unrecognized compensation expense, net of estimated forfeitures, related to non-vested restricted stock	$ 13,500		$ 13,500
Weighted-average period			17 years 3 months 19 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted under 2015 Equity Incentive Plan	6,500	6,845	6,500	6,845
Unrecognized compensation expense, net of estimated forfeitures, related to non-vested restricted stock	$ 1,200		$ 1,200
Weighted-average period			14 years 9 months 18 days
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued under employee stock purchase plan	1,022	726	1,022	726
Proceeds from issuance	$ 26	$ 23	$ 26	$ 23