Note 11 - Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

March 31, 2013	Pounds under contract (in thousands)				Average price per pound
	Zinc		Lead		Zinc		Lead
Contracts on provisional sales
2013 settlements		14,716		7,165	$	0.93	$	1.08
Contracts on forecasted sales
2013 settlements		30,258		26,951	$	0.98	$	1.09
2014 settlements		60,516		47,619	$	0.99	$	1.05
2015 settlements		20,944		37,864	$	1.00	$	1.07

December 31, 2012	Pounds under contract (in thousands)				Average price per pound
	Zinc		Lead		Zinc		Lead
Contracts on provisional sales
2013 settlements		14,991		6,945	$	0.95	$	1.00
Contracts on forecasted sales
2013 settlements		35,935		32,794	$	0.96	$	1.11
2014 settlements		30,203		33,069	$	0.98	$	1.03
2015 settlements		3,307		23,534	$	1.01	$	1.06