Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

v2.4.0.8
Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Summary of intangible asset    
Finite-Lived Intangible Assets, Gross Carrying Amount $ 2,870 $ 2,870
Finite-Lived Intangible Assets, Accumulated Amortization 627 582
Finite-Lived Intangible Assets, Net Carrying Amount 2,243 2,288
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 457 412
Finite-Lived Intangible Assets, Net Carrying Amount $ 2,243 $ 2,288