CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common shares [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings [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	93
Share repurchases	(2,977)
Shares withheld from common stock issued to pay employee payroll taxes
Exercise of stock options
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 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
Balance at beginning at Jun. 30, 2020	12,752	(1,586)	7,896	19,062
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	508
Share repurchases	(4,039)
Shares withheld from common stock issued to pay employee payroll taxes	(259)
Exercise of stock options	39
ESPP shares issued	58
Cumulative effect of change in accounting principle
Net income			3,597	3,597
Net change in unrealized gain (loss) from marketable securities, net of taxes		1,442
Balance at end at Mar. 31, 2021	9,059	(144)	11,493	20,408
Balance at beginning at Dec. 31, 2020	12,621	(280)	9,498	21,839
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	444
Share repurchases	(4,039)
Shares withheld from common stock issued to pay employee payroll taxes
Exercise of stock options
ESPP shares issued	33
Cumulative effect of change in accounting principle
Net income			1,995	1,995
Net change in unrealized gain (loss) from marketable securities, net of taxes		136
Balance at end at Mar. 31, 2021	$ 9,059	$ (144)	$ 11,493	$ 20,408