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Plant and Equipment (Details) - USD ($)
Mar. 31, 2016
Mar. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 47,258,000 $ 41,987,000
Less accumulated depreciation (31,159,000) (29,452,000)
Total 16,099,000 12,535,000
Foreign Countries [Member]    
Property, Plant and Equipment [Line Items]    
Total 3,431,000 3,913,000
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 29,340,000 25,963,000
Office Equipment and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10,527,000 8,602,000
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,391,000 $ 7,422,000