Significant Customer and Other Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Net Sales [Member]
Concentration Risk [Abstract]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Net Sales [Member] | Customer A [Member]
Concentration Risk [Abstract]
Concentration risk percentage	35.00%	38.00%	42.00%	39.00%
Net Sales [Member] | Customer B [Member]
Concentration Risk [Abstract]
Concentration risk percentage	26.00%	22.00%	24.00%	21.00%
Net Sales [Member] | Customer C [Member]
Concentration Risk [Abstract]
Concentration risk percentage	24.00%	25.00%	21.00%	23.00%
Net Sales [Member] | Rotating Electrical Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	72.00%	75.00%	76.00%	76.00%
Net Sales [Member] | Wheel Hub Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	14.00%	14.00%	14.00%	15.00%
Net Sales [Member] | Brake-Related Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	12.00%	9.00%	9.00%	7.00%
Net Sales [Member] | Other Products [Member]
Concentration Risk [Abstract]
Concentration risk percentage	2.00%	2.00%	1.00%	2.00%
Accounts Receivable - Trade [Member] | Customer A [Member]
Concentration Risk [Abstract]
Concentration risk percentage	39.00%				28.00%
Accounts Receivable - Trade [Member] | Customer B [Member]
Concentration Risk [Abstract]
Concentration risk percentage	29.00%				14.00%
Accounts Receivable - Trade [Member] | Customer C [Member]
Concentration Risk [Abstract]
Concentration risk percentage	0.00%				33.00%