Note 11 - Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

September 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		910		2		23,975		5,512	$	23.53	$	1,948	$	1.02	$	0.84
2021 settlements		—		—		6,945		—		N/A		N/A	$	1.12		N/A
Contracts on forecasted sales
2020 settlements		—		—		827		8,543		N/A		N/A	$	0.94	$	0.81
2021 settlements		—		—		27,448		12,136		N/A		N/A	$	1.06	$	0.86

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