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Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2013
Receivables [Abstract]  
Accounts receivable
   

September 30,

2013

 

December 31,

2012

 
    (Thousands)  
Trade receivables   $ 8,176   $ 7,488  
Less allowance for doubtful accounts     (338)     (305 )
Less allowance for returns     (1,781)     (1,572 )
               
Accounts receivable, net   $ 6,057   $ 5,611