CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common shares [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings/(accumulated deficit) [Member]	Total
Balance at beginning at Jun. 30, 2019	$ 15,815	$ (549)	$ 1,742	$ 17,008
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	12
Stock option exercise
Share repurchases	(681)
Shares withheld from common stock issued to employees to pay employee payroll taxes
ESPP shares issued	15
Cumulative effect of change in accounting principle			43
Net income			1,104	1,104
Net change in unrealized loss from marketable securities, net of taxes		(57)
Balance at end at Sep. 30, 2019	15,161	(606)	2,889	17,444
Balance at beginning at Jun. 30, 2020	$ 12,752	(1,586)	7,896	19,062
Balance at beginning (in shares) at Jun. 30, 2020	3,811,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	$ 26
Stock option exercise	39
Share repurchases
Shares withheld from common stock issued to employees to pay employee payroll taxes	(259)
ESPP shares issued	25
Cumulative effect of change in accounting principle
Net income			1,265	1,265
Net change in unrealized loss from marketable securities, net of taxes		(107)
Balance at end at Sep. 30, 2020	$ 12,583	$ (1,693)	$ 9,161	$ 20,051