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Concentrations of Credit Risk and Major Customers (Details 1)
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Accounts Receivable ,Percentage 76.90% 78.00% 79.30%
Customer A [Member]      
Accounts Receivable ,Percentage [1] 47.70% 51.40% 46.00%
Customer B [Member]      
Accounts Receivable ,Percentage [1] 18.00% 15.80% 10.70%
Customer C [Member]      
Accounts Receivable ,Percentage [2] 11.20% 10.80% 11.60%
Customer D [Member]      
Accounts Receivable ,Percentage [2] 11.00%
[1] Sales to this customer were reported in both of the Metal Stamping and Mechanical OEM and Electric OEM operating segments.
[2] Sales to this customer were reported in the Electric OEM operating segment.