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Credit Facility (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Revolving Credit Facility
Dec. 31, 2011
Revolving Credit Facility
Dec. 31, 2010
Revolving Credit Facility
Mar. 31, 2013
LIBOR-based Rate
Revolving Credit Facility
Mar. 31, 2013
CB Floating Rate
Revolving Credit Facility
Mar. 31, 2013
Maximum
Revolving Credit Facility
Mar. 31, 2013
Maximum
LIBOR-based Rate
Revolving Credit Facility
loan
Mar. 31, 2013
Minimum
Revolving Credit Facility
Line of Credit Facility [Line Items]                    
Borrowing base amount available     $ 29,000,000 $ 30,000,000 $ 20,000,000          
Maximum borrowing capacity       50,000,000 40,000,000          
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     1.45%              
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 $ 897,000