Note 6 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels [Table Text Block]

Quarterly Average Realized Silver Price ($ per ounce)		Quarterly Silver- Linked Dividend (cents per share)		Annualized Silver- Linked Dividend (cents per share)		Annualized Minimum Dividend (cents per share)		Annualized Dividends per Share: Silver- Linked and Minimum (cents per share)
$	25		0.75		3		1.5		4.5
$	30		1.25		5		1.5		6.5
$	35		2.25		9		1.5		10.5
$	40		3.25		13		1.5		14.5
$	45		4.25		17		1.5		18.5
$	50		5.25		21		1.5		22.5