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Note 12 - Business Segments, Sales of Products and Significant Customers (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

2020

  

2019

  

2018

 

Net sales to unaffiliated customers:

            

Greens Creek

 $327,820  $299,722  $265,650 

Lucky Friday

  63,025   16,621   9,750 

Casa Berardi

  209,224   192,944   210,339 

San Sebastian

  32,906   56,210   50,224 

Nevada Operations

  58,898   107,769   31,174 

Total sales to unaffiliated customers

 $691,873  $673,266  $567,137 

Income (loss) from operations:

            

Greens Creek

 $108,230  $84,868  $70,293 

Lucky Friday

  (1,711)  (12,520)  (20,199)

Casa Berardi

  1,359   (33,499)  881 

San Sebastian

  2,793   569   (14)

Nevada Operations

  (6,674)  (49,224)  (26,715)

Other

  (52,416)  (47,303)  (63,372)

Total (loss) income from operations

 $51,581  $(57,109) $(39,126)

Capital additions (including non-cash additions):

            

Greens Creek

 $23,665  $35,829  $43,631 

Lucky Friday

  27,284   7,861   14,236 

Casa Berardi

  47,576   33,906   39,816 

San Sebastian

  (47) — 3,906   8,492 

Nevada Operations

  4,003   42,154   35,721 

Other

  38   73   4,555 

Total capital additions

 $102,519  $123,729  $146,451 

Depreciation, depletion and amortization:

            

Greens Creek

 $49,692  $47,587  $46,511 

Lucky Friday

  11,473   1,175   1,012 

Casa Berardi

  69,572   73,960   71,302 

San Sebastian

  3,548   9,772   4,602 

Nevada Operations

  22,845   67,024   10,617 

Total depreciation, depletion and amortization

 $157,130  $199,518  $134,044 

Other significant non-cash items:

            

Greens Creek

 $3,103  $2,868  $3,325 

Lucky Friday

  881   996   618 

Casa Berardi

  (1,741)  5,203   696 

San Sebastian

  456   492   419 

Nevada Operations

  2,039   2,911   8,758 

Other

  6,426   (6,595)  (23,358)

Total other significant non-cash items

 $11,164  $5,875  $(9,542)

Identifiable assets:

            

Greens Creek

 $610,360  $639,047  $637,386 

Lucky Friday

  520,463   440,615   437,499 

Casa Berardi

  694,522   703,511   754,248 

San Sebastian

  42,617   48,294   44,152 

Nevada Operations

  513,309   528,466   581,194 

Other

  286,453   277,375   249,465 

Total identifiable assets

 $2,667,724  $2,637,308  $2,703,944 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

2020

  

2019

 

United States

 $1,701,307  $1,748,406 

Canada

  635,788   660,859 

Mexico

  8,124   14,433 

Total long-lived assets

 $2,345,219  $2,423,698 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

Greens Creek

  47.4

%

  44.5

%

  46.7

%

Lucky Friday

  9.1

%

  2.5

%

  1.8

%

Casa Berardi

  30.2

%

  28.7

%

  37.1

%

San Sebastian

  4.8

%

  8.3

%

  8.9

%

Nevada Operations

  8.5

%

  16.0

%

  5.5

%

   100

%

  100

%

  100

%

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

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

Silver

 $260,227  $192,235  $144,609 

Gold

  356,166   388,602   313,076 

Lead

  48,776   35,777   33,829 

Zinc

  95,065   89,656   99,800 

Less: Smelter and refining charges

  (68,361)  (33,004)  (24,177)

Sales of products

 $691,873  $673,266  $567,137 
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

Doré and metals from doré

 $266,536  $340,912  $306,328 

Carbon

  60,302   37,645   5,239 

Lead concentrate

  281,050   200,456   148,880 

Zinc concentrate

  76,481   74,160   80,938 

Bulk concentrate

  23,884   21,376   17,668 

Total, excluding gains/losses on forward contracts

 $708,253  $674,549  $559,053 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

2020

  

2019

  

2018

 

United States

 $292,704  $53,612  $48,437 

Canada

  145,670   379,095   322,402 

Japan

  39,418   48,841   42,885 

Netherlands

  (923)  38,420    

Korea

  165,302   154,581   145,263 

China

  66,082      66 

Total, excluding gains/losses on forward contracts

 $708,253  $674,549  $559,053 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

  

2018

 

CIBC

  32.7

%

  23.1

%

  29.7

%

Teck Metals Ltd.

  16.1

%

  8.2

%

  8.4

%

Ocean Partners

  13.9

%

  5.7

%

  2.5

%

Korea Zinc

  13.3

%

  17.4

%

  17.8

%

Scotia

  2.9

%

  24.0

%

  15.3

%