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Note 6 - Business Segments and Sales of Products (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Three Months Ended
March 31,

 
   

2020

   

2019

 

Net sales to unaffiliated customers:

               

Greens Creek

  $ 53,833     $ 80,129  

Lucky Friday

    2,830       2,182  

Casa Berardi

    46,172       40,062  

San Sebastian

    9,927       12,600  

Nevada Operations

    24,163       17,644  
    $ 136,925     $ 152,617  

Income (loss) from operations:

               

Greens Creek

  $ 4,117     $ 25,433  

Lucky Friday

    (8,120 )     (2,781 )

Casa Berardi

    (3,880 )     (10,519 )

San Sebastian

    679       (1,512 )

Nevada Operations

    2,889       (13,991 )

Other

    (10,645 )     (12,754 )
    $ (14,960 )   $ (16,124 )
   

March 31,

2020

   

December 31,

2019

 

Identifiable assets:

               

Greens Creek

  $ 631,246     $ 639,047  

Lucky Friday

    488,854       440,615  

Casa Berardi

    698,433       703,511  

San Sebastian

    35,254       48,294  

Nevada Operations

    522,899       528,466  

Other

    387,438       277,375  
    $ 2,764,124     $ 2,637,308  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

Three Months Ended

March 31,

 
   

2020

   

2019

 
                 

Greens Creek

    39

%

    53

%

Lucky Friday

    2

%

    1

%

Casa Berardi

    34

%

    26

%

San Sebastian

    7

%

    8

%

Nevada Operations

    18

%

    12

%

      100

%

    100

%

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

Three Months Ended

March 31,

 
   

2020

   

2019

 
                 

Silver

  $ 37,572     $ 45,506  

Gold

    90,694       79,679  

Lead

    6,420       9,025  

Zinc

    17,308       24,755  

Less: Smelter and refining charges

    (15,069 )     (6,348 )

Sales of products

  $ 136,925     $ 152,617  
   

Three Months Ended

March 31,

 
   

2020

   

2019

 
                 

Doré and metals from doré

  $ 67,327     $ 75,449  

Carbon material

    19,368       452  

Lead concentrate

    34,154       49,300  

Zinc concentrate

    10,820       23,792  

Bulk concentrate

    3,576       6,100  

Total, excluding gains/losses on forward contracts

  $ 135,245     $ 155,093  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   

Three Months Ended

March 31,

 
   

2020

   

2019

 
                 

Canada

  $ 54,333     $ 92,872  

Korea

    26,607       49,300  

Japan

    6,121       8,350  

China

    13,921        

United States

    35,185       4,571  

Other

    (922 )      

Total, excluding gains/losses on forward contracts

  $ 135,245     $ 155,093  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Three Months Ended

March 31,

 
   

2020

   

2019

 
                 

CIBC

    30

%

    16

%

Korea Zinc

    19

%

    20

%

Asahi

    17

%

    2

%

Scotia

    15

%

    29

%

IXM

    10

%

   

%

Teck Metals Ltd.

    2

%

    15

%

Trafigura

   

%

    12

%