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Note 4 - Business Segments, Sales of Products and Significant Customers (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

2021

  

2020

  

2019

 

Net sales to unaffiliated customers:

            

Greens Creek

 $384,843  $327,820  $299,722 

Lucky Friday

  131,488   63,025   16,621 

Casa Berardi

  245,152   209,224   192,944 

Nevada Operations

  45,814   58,898   107,769 

Other

  176   32,906   56,210 

Total sales to unaffiliated customers

 $807,473  $691,873  $673,266 

Income (loss) from operations:

            

Greens Creek (1)

 $164,666  $114,607  $87,232 

Lucky Friday

  31,683   (1,711)  (12,520)

Casa Berardi (1)

  5,807   10,379   (25,432)

Nevada Operations

  (46,115)  (6,674)  (49,224)

Other

  (72,621)  (49,623)  (46,734)

Total income (loss) from operations (1)

 $83,420  $66,978  $(46,678)

Capital additions (excluding non-cash items):

            

Greens Creek

 $23,883  $19,685  $29,570 

Lucky Friday

  29,885   25,776   8,989 

Casa Berardi

  49,617   40,840   36,059 

Nevada Operations

  5,470   4,003   42,953 

Other

  193   712   3,850 

Total capital additions

 $109,048  $91,016  $121,421 

Depreciation, depletion and amortization:

            

Greens Creek

 $48,710   49,692  $47,587 

Lucky Friday

  26,846   11,473   1,175 

Casa Berardi (1)

  80,744   60,552   65,893 

Nevada Operations

  15,341   22,845   67,024 

Other

  152   3,548   9,772 

Total depreciation, depletion and amortization (1)

 $171,793  $148,110  $191,451 

Other significant non-cash items:

            

Greens Creek

 $3,653  $3,103  $2,868 

Lucky Friday

  1,048   881   996 

Casa Berardi

  1,284   (1,741)  5,203 

Nevada Operations

  7,740   2,039   2,911 

Other (1)

  (20,030)  8,569   (2,684)

Total other significant non-cash items

 $(6,305) $12,851  $9,294 

Identifiable assets:

            

Greens Creek

 $589,944  $610,360  $639,047 

Lucky Friday

  516,545   520,463   440,615 

Casa Berardi (1)

  701,868   727,008   726,977 

Nevada Operations

  468,985   513,309   528,466 

Other

  451,466   329,070   325,669 

Total identifiable assets (1)

 $2,728,808  $2,700,210  $2,660,774 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

2021

  

2020

 

United States

 $1,662,689  $1,701,307 

Canada (1)

  640,367   668,643 

Mexico

  7,754   8,124 

Total long-lived assets (1)

 $2,310,810  $2,378,074 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Greens Creek

  47.6%  47.4%  44.5%

Lucky Friday

  16.3%  9.1%  2.5%

Casa Berardi

  30.4%  30.2%  28.7%

Nevada Operations

  5.7%  8.5%  16.0%

Other

  %  4.8%  8.3%
   100%  100%  100%
Revenue from External Customers by Products and Services [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Silver

 $293,646  $260,227  $192,235 

Gold

  362,037   356,166   388,602 

Lead

  75,431   48,776   35,777 

Zinc

  125,292   95,065   89,656 

Less: Smelter and refining charges

  (48,933)  (68,361)  (33,004)

Sales of products

 $807,473  $691,873  $673,266 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

2021

  

2020

  

2019

 

United States

 $71,278  $115,378  $53,612 

Canada

  419,090   321,896   379,095 

Japan

  63,588   39,418   48,841 

Netherlands

     (923)  38,420 

Korea

  203,115   166,402   154,581 

China

  50,945   66,082    

Total, excluding gains/losses on forward contracts

 $808,016  $708,253  $674,549 
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

Doré and metals from doré

 $313,337  $266,536  $340,912 

Carbon

  4,117   60,302   37,645 

Silver concentrate

  345,732   281,050   200,456 

Zinc concentrate

  112,448   76,481   74,160 

Precious metals concentrate

  32,382   23,884   21,376 

Total, excluding gains/losses on forward contracts

 $808,016  $708,253  $674,549 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
  

Year Ended December 31,

 
  

2021

  

2020

  

2019

 

CIBC

  37.2%  32.7%  23.1%

Teck Metals Ltd.

  21.5%  16.1%  8.2%

Ocean Partners

  6.2%  13.9%  5.7%

Korea Zinc

  21.6%  13.3%  17.4%

Scotia

  %  2.9%  24.0%