Note 11 - Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

June 30, 2020	Ounces/pounds under contract (in 000's)								Average price per ounce/pound
	Silver		Gold		Zinc		Lead		Silver		Gold		Zinc		Lead
	(ounces)		(ounces)		(pounds)		(pounds)		(ounces)		(ounces)		(pounds)		(pounds)
Contracts on provisional sales
2020 settlements		2,303		7		17,086		11,409	$	16.97	$	1,728	$	0.89	$	0.75
Contracts on forecasted sales
2020 settlements		—		—		26,731		8,322		N/A		N/A	$	0.88	$	0.78
2021 settlements		—		—		4,134		1,102		N/A		N/A	$	0.91	$	0.77

December 31, 2019	Ounces/pounds under contract (in 000's)								Average price per ounce/pound
	Silver		Gold		Zinc		Lead		Silver		Gold		Zinc		Lead
	(ounces)		(ounces)		(pounds)		(pounds)		(ounces)		(ounces)		(pounds)		(pounds)
Contracts on provisional sales
2020 settlements		2,556		10		21,550		5,159	$	17.20	$	1,481	$	1.04	$	0.88
Contracts on forecasted sales
2020 settlements		—		—		441		11,740		N/A		N/A	$	1.13	$	0.98

June 30, 2020	Ounces under contract (in 000's)				Average price per ounce
	Silver		Gold		Silver		Gold
	(ounces)		(ounces)		(ounces)		(ounces)
Contracts on forecasted sales
2020 settlements		2,718		73	$	15.67	$	1,633

December 31, 2019	Ounces under contract (in 000's)				Average price per ounce
	Silver		Gold		Silver		Gold
	(ounces)		(ounces)		(ounces)		(ounces)
Contracts on forecasted sales
2020 settlements		5,700		130	$	15.73	$	1,435