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Note 6 - Business Segments and Sales of Products (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Three Months Ended
June 30,

   

Six Months Ended

June 30,

 
   

2019

   

2018

   

2019

   

2018

 

Net sales to unaffiliated customers:

                               

Greens Creek

  $ 55,398     $ 74,605     $ 135,527     $ 140,455  

Lucky Friday

    4,951       3,287       7,133       8,264  

Casa Berardi

    45,500       56,103       85,562       111,651  

San Sebastian

    10,993       13,264       23,593       26,598  

Nevada Operations

    17,330             34,974        
    $ 134,172     $ 147,259     $ 286,789     $ 286,968  

Income (loss) from operations:

                               

Greens Creek

  $ 9,141     $ 25,516     $ 34,574     $ 48,668  

Lucky Friday

    (2,271

)

    (5,261

)

    (5,052

)

    (9,407

)

Casa Berardi

    (15,363

)

    1,014       (25,882

)

    4,264  

San Sebastian

    (1,923

)

    (361

)

    (3,435

)

    4,656  

Nevada Operations

    (21,475

)

          (35,466

)

     

Other

    (11,586

)

    (17,152

)

    (24,340

)

    (32,476

)

    $ (43,477

)

  $ 3,756     $ (59,601

)

  $ 15,705  
   

June 30, 2019

   

December 31, 2018

 

Identifiable assets:

               

Greens Creek

  $ 643,811     $ 637,386  

Lucky Friday

    438,362       437,499  

Casa Berardi

    722,882       754,248  

San Sebastian

    53,606       44,152  

Nevada Operations

    571,177       581,194  

Other

    240,875       249,465  
    $ 2,670,713     $ 2,703,944  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

Greens Creek

    41

%

    51

%

    48

%

    49

%

Lucky Friday

    4

%

    2

%

    2

%

    3

%

Casa Berardi

    34

%

    38

%

    30

%

    39

%

San Sebastian

    8

%

    9

%

    8

%

    9

%

Nevada Operations

    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,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

Silver

  $ 36,298     $ 38,425     $ 81,804     $ 73,647  

Gold

    78,166       77,635       157,845       150,679  

Lead

    6,670       10,690       15,695       19,917  

Zinc

    22,948       27,614       47,703       57,723  

Less: Smelter and refining charges

    (9,910

)

    (7,105

)

    (16,258

)

    (14,998

)

    $ 134,172     $ 147,259     $ 286,789     $ 286,968  
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

Doré and metals from doré

  $ 77,596     $ 75,526     $ 153,497     $ 149,018  

Lead concentrate

    35,742       42,149       85,042       76,483  

Zinc concentrate

    15,738       22,579       39,530       48,231  

Bulk concentrate

    3,803       4,309       9,903       9,925  

Total, excluding gains/losses on forward contracts

  $ 132,879     $ 144,563     $ 287,972     $ 283,657  
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,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

Canada

  $ 78,158     $ 94,524     $ 171,030     $ 183,192  

Korea

    26,202       41,537       75,501       74,240  

Japan

    9,236       3,897       17,585       17,670  

Netherlands

    16,055             16,055        

China

          198             67  

United States

    3,228       4,407       7,801       8,488  

Total, excluding gains/losses on forward contracts

  $ 132,879     $ 144,563     $ 287,972     $ 283,657  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2019

   

2018

   

2019

   

2018

 
                                 

CIBC

    24

%

    28

%

    19

%

    38

%

Scotia

    28

%

    18

%

    28

%

    10

%

Korea Zinc

    20

%

    28

%

    20

%

    26

%

Teck Metals Ltd.

    3

%

    17

%

    9

%

    11

%

Ocean Partners

    12

%

   

%

    6

%

   

%