Intangible Assets (Details) (USD $)	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Intangible assets subject to amortization [Abstract]
Impairment	$ 16,330,000	$ 0	$ 0
Rotating Electrical [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	11 years
Gross Carrying Value	7,274,000	7,274,000
Accumulated Amortization	3,291,000	2,518,000
Rotating Electrical [Member] \| Trademarks [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	9 years
Gross Carrying Value	553,000	553,000
Accumulated Amortization	337,000	262,000
Rotating Electrical [Member] \| Customer Relationships [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	12 years
Gross Carrying Value	6,464,000	6,464,000
Accumulated Amortization	2,743,000	2,096,000
Rotating Electrical [Member] \| Non-compete Agreements [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	4 years
Gross Carrying Value	257,000	257,000
Accumulated Amortization	211,000	160,000
Undercar Product Line [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	16 years
Gross Carrying Value	18,983,000	18,983,000
Accumulated Amortization	2,653,000	1,255,000
Impairment	16,330,000
Undercar Product Line [Member] \| Trademarks [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	20 years
Gross Carrying Value	11,159,000	11,159,000
Accumulated Amortization	1,058,000	500,000
Impairment	10,101,000
Undercar Product Line [Member] \| Customer Relationships [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	10 years
Gross Carrying Value	7,680,000	7,680,000
Accumulated Amortization	1,459,000	691,000
Impairment	6,221,000
Undercar Product Line [Member] \| Non-compete Agreements [Member]
Intangible assets subject to amortization [Abstract]
Weighted Average Amortization Period	2 years
Gross Carrying Value	144,000	144,000
Accumulated Amortization	136,000	64,000
Impairment	$ 8,000

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 46

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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