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Note 6 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 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 per Share

  

Annualized Silver-Linked Dividend per Share

  

Annualized Minimum Dividend

  

Annualized Dividends per Share: Silver-Linked and Minimum

 
$25  $0.0075  $0.03  $0.015  $0.045 
$30  $0.0125  $0.05  $0.015  $0.065 
$35  $0.0225  $0.09  $0.015  $0.105 
$40  $0.0325  $0.13  $0.015  $0.145 
$45  $0.0425  $0.17  $0.015  $0.185 
$50  $0.0525  $0.21  $0.015  $0.225