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Receivables and Net Sales (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Receivables and Net Sales    
Accounts receivable-trade $ 17,544,000 $ 18,331,000
Less allowance for doubtful receivables (512,000) (495,000)
Receivables, net 17,032,000 17,836,000
Provision for doubtful accounts $ 32,000 $ 113,000