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, 2018	$ 19,835	$ (153)	$ (2,406)	$ 17,276
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	28
Shares issued under ATM
Share repurchases	(2,675)
Shares withheld from common stock issued to employees to pay employee payroll taxes	(101)
Exercise of stock options	7
Exercise of stock options (in shares)				3,000
ESPP shares issued	22
Cumulative effect of change in accounting principle
Net income			3,260	$ 3,260
Net change in unrealized gain (loss) from marketable securities, net of taxes		(163)
Balance at end at Mar. 31, 2019	17,116	(316)	854	17,654
Balance at beginning at Dec. 31, 2018	17,209	(349)	122
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	10
Share repurchases	(115)
Shares withheld from common stock issued to employees to pay employee payroll taxes
Exercise of stock options
ESPP shares issued	12
Cumulative effect of change in accounting principle
Net income			732	732
Net change in unrealized gain (loss) from marketable securities, net of taxes		33
Balance at end at Mar. 31, 2019	17,116	(316)	854	17,654
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	93
Share repurchases	(2,977)
Shares withheld from common stock issued to employees to pay employee payroll taxes
Exercise of stock options
Exercise of stock options (in shares)
ESPP shares issued	39
Cumulative effect of change in accounting principle			42
Net income			3,567	$ 3,567
Net change in unrealized gain (loss) from marketable securities, net of taxes		(613)
Balance at end at Mar. 31, 2020	12,970	(1,162)	5,351	17,159
Balance at beginning at Dec. 31, 2019	13,634	100	4,138	17,872
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	74
Share repurchases	(761)
Shares withheld from common stock issued to employees to pay employee payroll taxes
Exercise of stock options
ESPP shares issued	23
Cumulative effect of change in accounting principle
Net income			1,213	1,213
Net change in unrealized gain (loss) from marketable securities, net of taxes		(1,262)
Balance at end at Mar. 31, 2020	$ 12,970	$ (1,162)	$ 5,351	$ 17,159