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

Three Months Ended
September 30,

  

Nine Months Ended
September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Net sales to unaffiliated customers:

                

Greens Creek

 $93,494  $59,015  $232,218  $194,542 

Lucky Friday

  20,812   4,017   35,097   11,150 

Casa Berardi

  53,554   53,453   149,731   139,015 

San Sebastian

  9,138   15,435   23,998   39,028 

Nevada Operations

  22,705   29,612   61,939   64,586 
  $199,703  $161,532  $502,983  $448,321 

Income (loss) from operations:

                

Greens Creek

 $41,527  $17,556  $72,394  $52,130 

Lucky Friday

  957   (3,727)  (12,381)  (8,779)

Casa Berardi

  (828)  (380)  (1,504)  (26,262)

San Sebastian

  1,946   1,077   1,766   (2,358)

Nevada Operations

  5,489   (8,346)  6,112   (43,812)

Other

  (17,762)  (11,293)  (40,144)  (35,633)
  $31,329  $(5,113) $26,243  $(64,714)
  

September 30, 2020

  

December 31, 2019

 

Identifiable assets:

        

Greens Creek

 $612,963  $639,047 

Lucky Friday

  508,053   440,615 

Casa Berardi

  695,629   703,511 

San Sebastian

  35,973   48,294 

Nevada Operations

  520,871   528,466 

Other

  241,661   277,375 
  $2,615,150  $2,637,308 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Greens Creek

  47

%

  37

%

  46

%

  44

%

Lucky Friday

  10

%

  2

%

  7

%

  2

%

Casa Berardi

  27

%

  33

%

  30

%

  31

%

San Sebastian

  5

%

  10

%

  5

%

  9

%

Nevada Operations

  11

%

  18

%

  12

%

  14

%

   100

%

  100

%

  100

%

  100

%

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

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Silver

 $79,684  $40,588  $179,013  $122,392 

Gold

  98,457   103,889   278,363   261,734 

Lead

  13,370   7,114   32,244   22,809 

Zinc

  26,779   15,292   65,540   62,995 

Less: Smelter and refining charges

  (18,587)  (5,351)  (52,177)  (21,609)

Sales of products

 $199,703  $161,532  $502,983  $448,321 
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Doré and metals from doré

 $67,659  $87,525  $211,439  $231,391 

Carbon

  23,835   17,745   43,099   27,376 

Lead concentrate

  85,511   37,685   192,179   122,727 

Zinc concentrate

  24,322   12,345   51,727   51,876 

Bulk concentrate

  7,935   5,184   17,417   15,088 

Total, excluding gains/losses on derivative contracts

 $209,262  $160,484  $515,861  $448,458 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

Canada

 $80,410  $88,610  $89,998  $258,708 

Korea

  78,152   33,683   129,939   109,184 

Japan

  14,337   17,339   32,071   34,924 

Netherlands

     445   (923)  16,500 

China

  2,736      41,744    

United States

  33,627   20,407   223,032   29,142 

Total, excluding gains/losses on derivative contracts

 $209,262  $160,484  $515,861  $448,458 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
  

Three Months Ended

September 30,

  

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 
                 

CIBC

  31

%

  36

%

  31

%

  24

%

Ocean Partners

  25

%

  

%

  10

%

  

%

Korea Zinc

  15

%

  9

%

  16

%

  16

%

Teck Metals Ltd.

  12

%

  3

%

  12

%

  7

%

Scotia

  

%

  18

%

  4

%

  26

%

Cliveden

  

%

  12

%

  

%

  4

%