Significant Customers (Details Textual)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Significant Customers (Textual) [Abstract]
Approximate percentage of sales of metals to counterparties companies related to metal sales	91.58%	80.00%
Approximate percentage of sales of silver concentrates to third party smelters related to metal sales	8.42%	20.00%