Inventories (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Inventories
Metals inventory	$ 212,000	$ 477,000
In-process inventory	161,000	307,000
Material and supplies	793,000	713,000
Inventories	1,166,000	1,497,000
Inventory write down charged to cost of metals sold	100,000	1,200,000
Inventory write down charged to depreciation expense		$ 700,000