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Note 11 - Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Schedule of Potential Per Share Dividend Amounts Quarterly Price Levels

Quarterly Average Realized Silver Price ($ per ounce)

 

Quarterly Silver-Linked Dividend ($ per share)

 

 

Annualized Silver-Linked Dividend ($ per share)

 

 

Annualized Minimum Dividend ($ per share)

 

 

Annualized Dividends per Share: Silver-Linked and Minimum ($ per share)

 

<$20

 

$

—

 

 

$

—

 

 

$

0.015

 

 

$

0.015

 

$20

 

$

0.0025

 

 

$

0.01

 

 

$

0.015

 

 

$

0.025

 

$25

 

$

0.0100

 

 

$

0.04

 

 

$

0.015

 

 

$

0.055

 

$30

 

$

0.0150

 

 

$

0.06

 

 

$

0.015

 

 

$

0.075

 

$35

 

$

0.0250

 

 

$

0.10

 

 

$

0.015

 

 

$

0.115

 

$40

 

$

0.0350

 

 

$

0.14

 

 

$

0.015

 

 

$

0.155

 

$45

 

$

0.0450

 

 

$

0.18

 

 

$

0.015

 

 

$

0.195

 

$50

 

$

0.0550

 

 

$

0.22

 

 

$

0.015

 

 

$

0.235

 
Schedule of Stockholders' Equity Note, Warrants or Rights

Number of warrants

 

Exercise price

 

 

Expiration date

2,068,000

 

$

1.57

 

 

February 2029

2,068,000

 

$

8.02

 

 

April 2032
Share-Based Payment Arrangement, Performance Shares, Activity

 

 

Shares

 

 

Weighted Average
Grant Date Fair
Value per Share

 

Unvested, January 1, 2020

 

 

1,477,631

 

 

$

0.79

 

Granted

 

 

597,360

 

 

$

0.31

 

Forfeited

 

 

(261,096

)

 

$

2.37

 

Unvested, December 31, 2020

 

 

1,813,895

 

 

$

0.41

 

Granted

 

 

122,462

 

 

$

13.70

 

Canceled

 

 

(174,108

)

 

$

0.76

 

Vested(1)

 

 

(887,827

)

 

$

—

 

Unvested, December 31, 2021

 

 

874,422

 

 

$

2.61

 

Granted

 

 

322,796

 

 

$

3.78

 

Vested(1)

 

 

(597,360

)

 

$

0.31

 

Unvested, December 31, 2022

 

 

599,858

 

 

$

5.54

 

(1) Vested on December 31 and distributed in February of the following year

 

 

 

 

 

 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity

 

 

Shares

 

 

Weighted Average
Grant Date Fair
Value per Share

 

Unvested, January 1, 2020

 

 

3,997,168

 

 

$

2.46

 

Granted

 

 

1,688,111

 

 

$

3.03

 

Canceled

 

 

(70,236

)

 

$

2.08

 

Vested

 

 

(1,678,909

)

 

$

2.83

 

Unvested, December 31, 2020

 

 

3,936,134

 

 

$

2.55

 

Granted

 

 

629,437

 

 

$

7.88

 

Canceled

 

 

(770,416

)

 

$

2.82

 

Vested

 

 

(1,772,803

)

 

$

2.60

 

Unvested, December 31, 2021

 

 

2,022,352

 

 

$

3.97

 

Granted

 

 

1,256,532

 

 

$

4.41

 

Canceled

 

 

(177,801

)

 

$

4.41

 

Vested

 

 

(1,304,968

)

 

$

3.97

 

Unvested, December 31, 2022

 

 

1,796,115

 

 

$

4.23