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Concentrations of Credit Risk and Major Customers (Details 1)
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Accounts Receivable ,Percentage 69.00% 76.90% 78.00%
Customer A [Member]      
Accounts Receivable ,Percentage [1] 48.20% 47.70% 51.40%
Customer B [Member]      
Accounts Receivable ,Percentage [1] 20.80% 18.00% 15.80%
Customer C [Member]      
Accounts Receivable ,Percentage [2] 11.20% 10.80%
[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.