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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

%