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Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Summary of intangible asset |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | $ 2,870 | $ 2,870
Finite-Lived Intangible Assets, Accumulated Amortization | 582 | 402
Finite-Lived Intangible Assets, Net Carrying Amount | 2,288 | 2,468
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite Lived Intangible Assets, Gross Carrying Amount | 12,800 | 12,800
Indefinite Lived Intangible Assets, Net Carrying Amount | 12,800 | 12,800
Permits [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite Lived Intangible Assets, Gross Carrying Amount | 10,300 | 10,300
Indefinite Lived Intangible Assets, Net Carrying Amount | 10,300 | 10,300
Tradename [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite Lived Intangible Assets, Gross Carrying Amount | 2,500 | 2,500
Indefinite Lived Intangible Assets, Net Carrying Amount | 2,500 | 2,500
Backlog [Member] |  |
Summary of intangible asset |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 170 | 170
Finite-Lived Intangible Assets, Accumulated Amortization | 170 | 170
Customer relationships [Member] |  |
Summary of intangible asset |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 2,700 | 2,700
Finite-Lived Intangible Assets, Accumulated Amortization | 412 | 232
Finite-Lived Intangible Assets, Net Carrying Amount | $ 2,288 | $ 2,468

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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of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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