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Plant and Equipment (Details) - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 52,036,000 $ 47,258,000
Less accumulated depreciation (33,599,000) (31,159,000)
Total 18,437,000 16,099,000
Foreign Countries [Member]    
Property, Plant and Equipment [Line Items]    
Total 3,855,000 3,431,000
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 32,589,000 29,340,000
Office Equipment and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 11,806,000 10,527,000
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,641,000 $ 7,391,000