Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

v2.4.0.6
Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Mar. 31, 2012
Summary of intangible asset    
Finite-Lived Intangible Assets, Gross Carrying Amount $ 2,870 $ 2,870
Finite-Lived Intangible Assets, Accumulated Amortization 492 402
Finite-Lived Intangible Assets, Net Carrying Amount 2,378 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
Finite-Lived Intangible Assets, Net Carrying Amount      
Customer relationships [Member]
    
Summary of intangible asset    
Finite-Lived Intangible Assets, Gross Carrying Amount 2,700 2,700
Finite-Lived Intangible Assets, Accumulated Amortization 322 232
Finite-Lived Intangible Assets, Net Carrying Amount $ 2,378 $ 2,468