Shareholders' Equity - Activity of Company's Share Options (Detail) - $ / shares	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares, Options outstanding, Beginning balance	410,000	480,000
Number of Shares, Granted	0	0
Number of Shares, Exercised	(30,000)	(70,000)
Number of Shares, Options outstanding, Ending balance	380,000	410,000
Exercisable, Number of Shares, Options outstanding, Ending balance	380,000	410,000
Options Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 1.34	$ 1.35
Weighted Average Exercise Price, Exercised	1.67	1.39
Options Outstanding, Weighted Average Exercise Price, Ending Balance	1.31	1.34
Exercisable, Weighted Average Exercise Price, Ending balance	1.31	1.34
Range of Exercise Prices, Exercised	1.67
Minimum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Options, Range of Exercise Prices, Beginning balance	0.71	1.79
Range of Exercise Prices, Exercised		0.71
Outstanding Options, Range of Exercise Prices, Ending balance	0.71	0.71
Exercisable, Range of Exercise Prices, Ending balance	0.71	0.71
Maximum [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Options, Range of Exercise Prices, Beginning balance	1.79	2.09
Range of Exercise Prices, Exercised		1.79
Outstanding Options, Range of Exercise Prices, Ending balance	1.79	1.79
Exercisable, Range of Exercise Prices, Ending balance	$ 1.79	$ 1.79