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Receivables (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Receivables    
Accounts receivable-trade $ 17,980,000 $ 16,972,000
Less allowance for doubtful receivables (499,000) (502,000)
Receivables, net 17,481,000 16,470,000
Provision for doubtful accounts $ 16,000 $ 171,000