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Note 7 - Business Segments and Sales of Products (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
Net sales to unaffiliated customers:
                               
Greens Creek
  $
65,187
    $
61,062
    $
205,642
    $
191,250
 
Lucky Friday
   
(11
)
   
199
     
8,253
     
20,022
 
Casa Berardi
   
52,850
     
53,989
     
164,501
     
139,524
 
San Sebastian
   
14,129
     
25,589
     
40,727
     
66,866
 
Nevada Operations
   
11,494
     
     
11,494
     
 
    $
143,649
    $
140,839
    $
430,617
    $
417,662
 
Income (loss) from operations:
                               
Greens Creek
  $
10,705
    $
16,575
    $
59,373
    $
46,107
 
Lucky Friday
   
(5,404
)
   
(4,642
)
   
(14,811
)
   
(8,974
)
Casa Berardi
   
(1,146
)
   
2,208
     
3,118
     
(4,692
)
San Sebastian
   
(2,381
)
   
17,017
     
2,275
     
42,363
 
Nevada Operations
   
(13,741
)
   
     
(13,741
)
   
 
Other
   
(18,409
)
   
(10,890
)
   
(50,885
)
   
(37,637
)
    $
(30,376
)
  $
20,268
    $
(14,671
)
  $
37,167
 
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
September 30, 2018
   
December 31, 2017
 
Identifiable assets:
               
Greens Creek
  $
651,814
    $
671,960
 
Lucky Friday
   
429,334
     
432,400
 
Casa Berardi
   
758,415
     
784,706
 
San Sebastian
   
47,352
     
62,198
 
Nevada Operations
   
539,410
     
 
Other
   
283,933
     
393,894
 
    $
2,710,258
    $
2,345,158
 
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Greens Creek
   
45
%
   
43
%
   
48
%
   
46
%
Lucky Friday
   
%
   
%
   
2
%
   
5
%
Casa Berardi
   
37
%
   
38
%
   
39
%
   
33
%
San Sebastian
   
10
%
   
19
%
   
9
%
   
16
%
Nevada Operations
   
8
%
   
%
   
2
%
   
%
     
100
%
   
100
%
   
100
%
   
100
%
Revenue from External Customers by Products and Services [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Silver
  $
38,009
    $
43,228
    $
111,656
    $
140,662
 
Gold
   
82,628
     
73,603
     
233,308
     
203,279
 
Lead
   
7,552
     
6,373
     
27,469
     
28,093
 
Zinc
   
20,990
     
24,327
     
78,714
     
74,692
 
Less: Smelter and refining charges
   
(5,530
)
   
(6,692
)
   
(20,530
)
   
(29,064
)
Sales of products   $
143,649
    $
140,839
    $
430,617
    $
417,662
 
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Doré and metals from doré
  $
83,068
    $
82,764
    $
232,085
    $
219,276
 
Lead concentrate
   
36,728
     
31,548
     
113,211
     
124,553
 
Zinc concentrate
   
14,965
     
21,278
     
63,197
     
61,841
 
Bulk concentrate
   
3,866
     
5,875
     
13,791
     
15,904
 
Total, excluding gains/losses on forward contracts
  $
138,627
    $
141,465
    $
422,284
    $
421,574
 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Canada
  $
83,723
    $
79,834
    $
266,915
    $
263,268
 
Korea
   
35,796
     
27,396
     
110,036
     
75,339
 
Japan
   
3,301
     
14,419
     
20,971
     
38,513
 
China
   
     
16,695
     
66
     
32,047
 
United States
   
15,807
     
3,121
     
24,296
     
12,407
 
Total, excluding gains/losses on forward contracts
  $
138,627
    $
141,465
    $
422,284
    $
421,574
 
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
CIBC
   
26
%
   
23
%
   
34
%
   
24
%
Scotia
   
19
%
   
33
%
   
13
%
   
26
%
Korea Zinc
   
15
%
   
25
%
   
22
%
   
20
%
Teck Metals Ltd.
   
11
%
   
%
   
11
%
   
10
%
Trafigura
   
10
%
   
%
   
3
%
   
4
%
Louis Dreyfus
   
%
   
12
%
   
%
   
4
%