Subsequent Event (Details) - USD ($)	1 Months Ended					2 Months Ended	3 Months Ended
	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2021	May 31, 2021	Feb. 28, 2021	Aug. 31, 2022	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	May 31, 2022	Apr. 30, 2022	Jan. 31, 2022
Subsequent Event
Investment in subsidiary with noncontrolling interest	$ 334,000						$ 1,179,000	$ 575,000	$ 576,000
Secured debt | NingBo Bank | Beijing Tongmei Xtal Technology
Subsequent Event
Maximum borrowing capacity							$ 1,500,000
Interest rate							4.80%
Xiaoyi XingAn Gallium Co., Ltd.
Subsequent Event
Dividend received			$ 774,000
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Initial funding				$ 1,500,000	$ 1,500,000
Percentage of ownership, equity method				58.50%	58.50%					58.50%	58.50%	58.50%
Subsequent Event | Secured debt | NingBo Bank | Beijing Tongmei Xtal Technology
Subsequent Event
Maximum borrowing capacity	$ 1,500,000					$ 1,500,000
Interest rate	4.80%					4.80%
Subsequent Event | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Initial funding						$ 1,000,000.0
Investment in subsidiary with noncontrolling interest		$ 600,000
Increase in noncontrolling interest	$ 406,000	610,000
Increase in redeemable noncontrolling interests	$ 73,000	57,000
Subsequent Event | Xiaoyi XingAn Gallium Co., Ltd.
Subsequent Event
Dividend received		$ 1,500,000
Subsequent Event | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Subsequent Event
Percentage of ownership, equity method		58.50%
Subsequent Event | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd | Beijing Tongmei Xtal Technology
Subsequent Event
Investment in subsidiary with noncontrolling interest		$ 800,000