Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Oct. 08, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, amount recognized	$ 0	$ 0		$ 0	$ 28,000
Options granted	0			0
Share options exercised, Shares	60,000
Additional common shares issued in cash-less option exchange	20,732
Stock repurchased during period, value		$ 97,000	$ 6,000
Stock repurchased during period, shares				87,534
2019-2020 Common Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased during period, value					$ 101,000
Stock repurchased during period, shares					87,534
Maximum [Member] | 2019-2020 Common Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of shares authorized to be repurchased						$ 750,000
2011 Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted					50,000