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Inventories (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Inventories      
Metals inventory $ 631,000   $ 2,076,000
In-process inventory     228,000
Material and supplies 618,000   1,084,000
Inventories 1,249,000   3,388,000
Inventory write down charged to cost of metals sold 1,600,000 2,100,000  
Inventory write down charged to depreciation expense $ 300,000 $ 700,000