Annual report pursuant to Section 13 and 15(d)

Schedule II--Valuation and Qualifying Accounts (Details)

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Schedule II--Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowances for accounts receivable
     
Valuation and qualifying accounts      
Beginning Balance $ 1,513 $ 1,473 $ 1,097
Charged to Cost and Expense 272 161 480
Deductions 199 121 104
Ending Balance 1,586 1,513 1,473
Reserve for inventory obsolescence
     
Valuation and qualifying accounts      
Beginning Balance 35 18 20
Charged to Cost and Expense 24 31  
Deductions 32 14 2
Ending Balance $ 27 $ 35 $ 18