Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Aug. 09, 2011
Long-term debt      
Less current installments $ (3,362) $ (3,350)  
Long-term debt less current installments 1,424 2,270  
Revolving Credit agreement
      
Long-term debt      
Maximum borrowing capacity     15,000
Variable rate basis LIBOR    
Margin on variable rate (as a percent) 1.25%    
Annual commitment fee (as a percent) 0.25%    
Remaining borrowing capacity 15,000    
Term loan
      
Long-term debt      
Variable rate basis LIBOR LIBOR  
Margin on variable rate (as a percent) 1.50% 1.50% 1.25%
Face amount 10,000    
Interest rate at period end (as a percent) 1.50% 1.50%  
Monthly installments, including interest 284 284  
Total long-term debt $ 4,786 $ 5,620