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Inventories, Net (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Raw materials $ 3,727,000 $ 3,486,000
Work in process 1,349,000 1,387,000
Finished goods 10,669,000 11,576,000
Allowance for excess quantities (687,000) (636,000)
Total inventories $ 15,058,075 $ 15,813,276