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Warranty
3 Months Ended
Mar. 31, 2012
Warranty [Abstract]  
Warranty
9. Warranty

The Company’s Energy efficiency services segment provides its customers a one year warranty for all parts and labor in its installation workmanship. The Company provides for the estimated cost of warranties, determined primarily from historical information and management’s judgment, at the time revenue is recognized. Should actual warranties differ from the Company’s estimates, revisions to the estimated warranty liability would be required. Accrued warranty expense as of March 31, 2012 was approximately $2,000.