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Credit Facility (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Revolving Credit Facility
Dec. 31, 2010
Revolving Credit Facility
Dec. 31, 2012
LIBOR-based Rate
Revolving Credit Facility
Dec. 31, 2012
CB Floating Rate
Revolving Credit Facility
Dec. 31, 2012
Maximum
Revolving Credit Facility
Dec. 31, 2012
Maximum
LIBOR-based Rate
Revolving Credit Facility
loan
Dec. 31, 2012
Minimum
Revolving Credit Facility
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity     $ 30,000,000 $ 20,000,000          
Potential maximum borrowing capacity     50,000,000 40,000,000          
Borrowing base amount available     29,000,000            
Potential increase in borrowing capacity     20,000,000            
Borrowing base, component, % of eligible accounts receivable     80.00%            
Borrowing base, component, % of eligible inventory     50.00%            
Borrowing base, allowable share of total commitment amount attributable to inventory component     50.00%            
Borrowing base, component, % of eligible equipment inventory     75.00%            
Reference rate, number of allowable LIBOR-based borrowings outstanding               3  
Variable rate, applicable margin         1.50% 1.25%      
Weighted average interest rate 1.46%                
Minimum commitment coverage ratio allowed                 2.00
Maximum leverage ratio allowed             2.50    
Default trigger, certain defaults of other company indebtedness, amount             50,000    
Default trigger, rendering of certain judgments, amount             150,000    
Line of credit, non-current portion $ 897,000 $ 1,017,000