Derivative Financial Instruments (Details)	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 ZAR
Derivative Financial Instruments
Net derivative (liabilities) assets	$ (27,000)	$ 25,000
Amount of reduction in foreign exchange (gains) and losses	51,000	(40,000)
Notional amount of forward contracts outstanding	$ 414,000		3,500,000