Note 11 - Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

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

March 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
2019 settlements		710		3		19,952		2,646	$	15.46	$	1,316	$	1.22	$	0.92
Contracts on forecasted sales
2019 settlements		—		—		26,180		1,653		N/A		N/A	$	1.25	$	0.96
2020 settlements		—		—		276		551		N/A		N/A	$	1.26	$	0.96

December 31, 2018

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

2019 settlements

842

4

18,450

2,700

$

14.69

$

1,260

$

1.15

$

0.89