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Plant and Equipment (Details) - USD ($)
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 84,484,000 $ 69,474,000
Less accumulated depreciation (39,527,000) (34,323,000)
Total 44,957,000 35,151,000
Foreign Countries [Member]    
Property, Plant and Equipment [Line Items]    
Total 35,410,000 25,608,000
Mexico [Member]    
Property, Plant and Equipment [Line Items]    
Total 31,845,000 21,822,000
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 48,424,000 39,953,000
Office Equipment and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 25,541,000 20,070,000
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 10,519,000 $ 9,451,000