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Subsequent Event (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 31, 2022
May 31, 2021
Feb. 28, 2021
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       $ 1,179,000 $ 575,000 $ 576,000      
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd.                  
Subsequent Event                  
Initial funding   $ 1,500,000 $ 1,500,000            
Increase in noncontrolling interest $ 610,000                
Percentage of ownership, equity method 58.50% 58.50% 58.50%       58.50% 58.50% 58.50%