Note 8 - Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

Quarterly average realized silver price per ounce		Quarterly dividend per share		Annualized dividend per share
	$30		$0.01		$0.04
	$35		$0.02		$0.08
	$40		$0.03		$0.12
	$45		$0.04		$0.16
	$50		$0.05		$0.20