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Note 11 - Business Segments, Sales of Products and Significant Customers (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

2019

   

2018

   

2017

 

Net sales to unaffiliated customers:

                       

Greens Creek

  $ 299,722     $ 265,650     $ 278,297  

Lucky Friday

    16,621       9,750       21,555  

Casa Berardi

    192,944       210,339       192,165  

San Sebastian

    56,210       50,224       85,758  

Nevada Operations

    107,769       31,174        

Total sales to unaffiliated customers

  $ 673,266     $ 567,137     $ 577,775  

Income (loss) from operations:

                       

Greens Creek

  $ 84,868     $ 70,293     $ 70,132  

Lucky Friday

    (12,520

)

    (20,199

)

    (16,037

)

Casa Berardi

    (33,499

)

    881       (534

)

San Sebastian

    569       (14

)

    53,591  

Nevada Operations

    (49,224

)

    (26,715

)

     

Other

    (47,303

)

    (63,372

)

    (47,046

)

Total (loss) income from operations

  $ (57,109

)

  $ (39,126

)

  $ 60,106  

Capital additions (including non-cash additions):

                       

Greens Creek

  $ 35,829     $ 43,631     $ 35,255  

Lucky Friday

    7,861       14,236       6,268  

Casa Berardi

    33,906       39,816       51,327  

San Sebastian

    3,906       8,492       9,994  

Nevada Operations

    42,154       35,721        

Other

    73       4,555       2,908  

Total capital additions

  $ 123,729     $ 146,451     $ 105,752  

Depreciation, depletion and amortization:

                       

Greens Creek

  $ 47,587     $ 46,511     $ 56,328  

Lucky Friday

    1,175       1,012       2,447  

Casa Berardi

    73,960       71,302       59,131  

San Sebastian

    9,772       4,602       2,693  

Nevada Operations

    67,024       10,617        

Total depreciation, depletion and amortization

  $ 199,518     $ 134,044     $ 120,599  

Other significant non-cash items:

                       

Greens Creek

  $ 2,868     $ 3,325     $ 2,685  

Lucky Friday

    996       618       2,011  

Casa Berardi

    5,203       696       33  

San Sebastian

    492       419       468  

Nevada Operations

    2,911       8,758        

Other

    (6,595

)

    (23,358

)

    52,266  

Total other significant non-cash items

  $ 5,875     $ (9,542

)

  $ 57,463  

Identifiable assets:

                       

Greens Creek

  $ 639,047     $ 637,386     $ 671,960  

Lucky Friday

    440,615       437,499       432,400  

Casa Berardi

    703,511       754,248       784,706  

San Sebastian

    48,294       44,152       62,198  

Nevada Operations

    528,466       581,194        

Other

    277,375       249,465       393,894  

Total identifiable assets

  $ 2,637,308     $ 2,703,944     $ 2,345,158  
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
   

2019

   

2018

 

United States

  $ 1,748,406     $ 1,797,441  

Canada

    660,859       707,473  

Mexico

    14,433       15,090  

Total long-lived assets

  $ 2,423,698     $ 2,520,004  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Greens Creek

    44.5

%

    46.7

%

    48.1

%

Lucky Friday

    2.5

%

    1.8

%

    3.8

%

Casa Berardi

    28.7

%

    37.1

%

    33.3

%

San Sebastian

    8.3

%

    8.9

%

    14.8

%

Nevada Operations

    16.0

%

    5.5

%

   

%

      100

%

    100

%

    100

%

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

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Silver

  $ 192,235     $ 144,609     $ 194,813  

Gold

    388,602       313,076       277,421  

Lead

    35,777       33,829       37,995  

Zinc

    89,656       99,800       104,023  

Less: Smelter and refining charges

    (33,004

)

    (24,177

)

    (36,477

)

Sales of products

  $ 673,266     $ 567,137     $ 577,775  
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Doré and metals from doré

  $ 340,912     $ 306,328     $ 292,930  

Carbon

    37,645       5,239       2,246  

Lead concentrate

    200,456       148,880       179,143  

Zinc concentrate

    74,160       80,938       88,688  

Bulk concentrate

    21,376       17,668       20,751  

Total, excluding gains/losses on forward contracts

  $ 674,549     $ 559,053     $ 583,758  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   

2019

   

2018

   

2017

 

United States

  $ 53,612     $ 48,437     $ 16,806  

Canada

    379,095       322,402       358,663  

Japan

    48,841       42,885       58,475  

Netherlands

    38,420              

Korea

    154,581       145,263       80,183  

China

          66       69,631  

Total, excluding gains/losses on forward contracts

  $ 674,549     $ 559,053     $ 583,758  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Teck Metals Ltd.

    8.2

%

    8.4

%

    11.3

%

Korea Zinc

    17.4

%

    17.8

%

    16.4

%

Scotia

    24.0

%

    15.3

%

    24.9

%

CIBC

    23.1

%

    29.7

%

    22.8

%