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Note 6 - Business Segments and Sales of Products (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

Three Months Ended
June 30,

  

Six Months Ended
June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Net sales to unaffiliated customers:

                

Greens Creek

 $84,890  $55,398  $138,724  $135,527 

Lucky Friday

  11,455   4,951   14,285   7,133 

Casa Berardi

  50,005   45,500   96,177   85,562 

San Sebastian

  4,934   10,993   14,860   23,593 

Nevada Operations

  15,071   17,330   39,234   34,974 
  $166,355  $134,172  $303,280  $286,789 

Income (loss) from operations:

                

Greens Creek

 $26,751  $9,141  $30,867  $34,574 

Lucky Friday

  (5,218)  (2,271)  (13,338)  (5,052)

Casa Berardi

  3,204   (15,363)  (676)  (25,882)

San Sebastian

  (859)  (1,923)  (180)  (3,435)

Nevada Operations

  (2,266)  (21,475)  623   (35,466)

Other

  (11,738)  (11,586)  (22,382)  (24,340)
  $9,874  $(43,477) $(5,086) $(59,601)
  

June 30, 2020

  

December 31, 2019

 

Identifiable assets:

        

Greens Creek

 $618,726  $639,047 

Lucky Friday

  501,690   440,615 

Casa Berardi

  693,259   703,511 

San Sebastian

  32,915   48,294 

Nevada Operations

  522,822   528,466 

Other

  233,996   277,375 
  $2,603,408  $2,637,308 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Three Months Ended

June 30,

  

Six Months Ended

June 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Greens Creek

  51

%

  41

%

  45

%

  48

%

Lucky Friday

  7

%

  4

%

  5

%

  2

%

Casa Berardi

  30

%

  34

%

  32

%

  30

%

San Sebastian

  3

%

  8

%

  5

%

  8

%

Nevada Operations

  9

%

  13

%

  13

%

  12

%

   100

%

  100

%

  100

%

  100

%

Revenue from External Customers by Products and Services [Table Text Block]
  

Three Months Ended

June 30,

  

Six Months Ended

June 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Silver

 $61,756  $36,298  $99,328  $81,804 

Gold

  89,212   78,166   179,906   157,845 

Lead

  12,454   6,670   18,874   15,695 

Zinc

  21,455   22,948   38,762   47,703 

Less: Smelter and refining charges

  (18,522)  (9,910)  (33,590)  (16,258)
  $166,355  $134,172  $303,280  $286,789 
  

Three Months Ended

June 30,

  

Six Months Ended

June 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Doré and metals from doré

 $59,445  $73,312  $143,780  $144,167 

Carbon

  16,903   4,284   19,264   9,330 

Lead concentrate

  72,514   35,742   106,667   85,042 

Zinc concentrate

  16,585   15,738   27,405   39,530 

Bulk concentrate

  5,906   3,803   9,482   9,903 

Total, excluding gains/losses on forward contracts

 $171,353  $132,879  $306,598  $287,972 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three Months Ended

June 30,

  

Six Months Ended

June 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Canada

 $80,311  $78,158  $62,152  $171,030 

Korea

  25,180   26,202   51,787   75,501 

Japan

  11,613   9,236   17,734   17,585 

Netherlands

  (2)  16,055   (923)  16,055 

China

  25,087   —   39,008   — 

United States

  29,048   3,228   136,785   7,801 

Other

  116   —   55   — 

Total, excluding gains/losses on forward contracts

 $171,353  $132,879  $306,598  $287,972 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
  

Three Months Ended

June 30,

  

Six Months Ended

June 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

CIBC

  31

%

  24

%

  31

%

  19

%

Teck Metals Ltd.

  20

%

  3

%

  12

%

  9

%

Korea Zinc

  15

%

  20

%

  17

%

  20

%

Ocean Partners

  13

%

  12

%

  7

%

  6

%

SIPI

  10

%

  3

%

  5

%

  3

%

Scotia

  —

%

  28

%

  7

%

  28

%