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Commitments and Contingencies (Details Textual) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2012
Dec. 31, 2012
Dec. 17, 2009
Commitments and Contingencies (Additional Textual) [Abstract]        
Accrued estimated losses   0 0  
Net loss for jury awards after insurance proceeds     275,000  
Maximum [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Remaining term of standby letters of credit     5 years  
Minimum [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Remaining term of standby letters of credit     1 month  
Pending Litigation [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Lawsuit filing date   November 18, 2010 December 17, 2009  
Awarded in damages to the plaintiffs 630,000      
Awarded in punitive damages       $ 200,000