STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Shares [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Total
Balance at beginning at Jun. 30, 2018	$ 19,835	$ (153)	$ (2,406)	$ 17,276
Balance at beginning (in shares) at Jun. 30, 2018	4,331,089
Net income			4,148	4,148
Exercise of stock options	$ 6			$ 6
Exercise of stock options (in shares)	3,000			3,000
Net change in unrealized gain/(loss) from marketable equity investments, net of tax		(396)		$ (396)
ESPP shares issued	$ 22			22
ESPP shares issued (in shares)	2,743
Shares issued in connection with performance award vesting
Shares issued in connection with performance award vesting (in shares)	40,000
Shares withheld from common stock issued to pay employee payroll taxes	$ (101)			(101)
Shares withheld from common stock issued to pay employee payroll taxes (in shares)	(15,273)
Share-based compensation	$ 37			37
Share repurchases	$ (3,984)			(3,984)
Share repurchases (in shares)	(322,068)
Balance at end at Jun. 30, 2019	$ 15,815	(549)	1,742	17,008
Balance at end (in shares) at Jun. 30, 2019	4,039,491
Net income			6,112	$ 6,112
Exercise of stock options (in shares)
Net change in unrealized gain/(loss) from marketable equity investments, net of tax		(1,037)		$ (1,037)
ESPP shares issued	$ 39			39
ESPP shares issued (in shares)	2,920
Cumulative effect of change in accounting principle			42	42
Share-based compensation	$ 286			286
Share repurchases	$ (3,388)			(3,388)
Share repurchases (in shares)	(231,274)
Balance at end at Jun. 30, 2020	$ 12,752	$ (1,586)	$ 7,896	$ 19,062
Balance at end (in shares) at Jun. 30, 2020	3,811,137