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4. Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
4. Property, Plant and Equipment

Property, plant and equipment consist of the following:

  March 31, 2013   December 31, 2012
Land $    2,844,513   $   2,837,780
Buildings    83,611,970     83,004,928
Furniture and fixtures         378,188          376,333
Machinery and equipment      2,226,671       2,615,140
Construction in progress           29,262            82,627
Total gross property, plant & equipment    89,090,604      88,916,808
Less accumulated depreciation    (6,212,158)      (5,023,336)
Total net property, plant & equipment $  82,878,446   $  83,893,472

For the three months ended March 31, 2013 and March 31, 2012, the Company recorded depreciation expense of $1,165,255 and $344,917, respectively.

Management is required to evaluate these long-lived assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Based on the evaluation, management has determined that no impairment existed as of December 31, 2012. On January 21, 2013 the Keyes plant was idled and remained idle for the remainder of the quarter ending March 2013. The carrying value of the Keyes plant fixed assets not in use at March 31, 2013 was $70,991,908. On April 22, 2013 the Company restarted its plant in Keyes, California. Management determined there was no need to impair the long-lived assets as of March 31, 2013.