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Inventories (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Components of inventories    
Raw materials $ 9,173,000 $ 11,039,000
Work in process 1,789,000 1,805,000
Finished goods 5,241,000 5,771,000
Inventories, net $ 16,203,380 $ 18,614,726