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Significant Customer and Other Information (Tables)
 12 Months Ended
Mar. 31, 2018
Significant Customer and Other Information [Abstract]  
Schedule of concentrations of risk
The Company’s largest customers accounted for the following total percentage of net sales:

  
Years Ended March 31,
 
  
2018
  
2017
  
2016
 
Customer A
  
41
%
  
44
%
  
48
%
Customer B
  
24
%
  
20
%
  
18
%
Customer C
  
19
%
  
19
%
  
21
%
Customer D
  
4
%
  
4
%
  
3
%

The Company’s largest customers accounted for the following total percentage of accounts receivable — trade at March 31:

  
2018
  
2017
 
Customer A
  
36
%
  
33
%
Customer B
  
16
%
  
18
%
Customer C
  
22
%
  
12
%
Customer D
  
5
%
  
16
%

Geographic and Product Information

The Company’s products are predominantly sold in the U.S. and accounted for the following total percentage of net sales:

  
Years Ended March 31,
 
  
2018
  
2017
  
2016
 
Rotating electrical products
  
78
%
  
78
%
  
78
%
Wheel hub products
  
17
%
  
19
%
  
20
%
Brake master cylinders products
  
2
%
  
3
%
  
2
%
Other products
  
3
%
  
-
%
  
-
%
   
100
%
  
100
%
  
100
%