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Credit Facility (Details) (Revolving Credit Facility, USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Line of Credit Facility [Line Items]      
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%    
Borrowing base amount available 28,900,000 30,000,000 20,000,000
Amount outstanding 1,000,000    
LIBOR-based Rate
      
Line of Credit Facility [Line Items]      
Variable rate, applicable margin 1.50%    
CB Floating Rate
      
Line of Credit Facility [Line Items]      
Variable rate, applicable margin 1.25%    
Maximum
      
Line of Credit Facility [Line Items]      
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    
Maximum | LIBOR-based Rate
      
Line of Credit Facility [Line Items]      
Reference rate, number of allowable LIBOR-based borrowings outstanding 3    
Minimum
      
Line of Credit Facility [Line Items]      
Minimum commitment coverage ratio allowed 2