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Note 6 - Business Segments and Sales of Products - Sales by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Sales by geographical area | $ 155,093 | $ 139,094
Sales by significant product type | 155,093 | 139,094
Doré and Metals from Doré [Member] |  |
Sales by geographical area | 75,901 | 73,492
Sales by significant product type | 75,901 | 73,492
Lead Concentrate [Member] |  |
Sales by geographical area | 49,300 | 34,334
Sales by significant product type | 49,300 | 34,334
Zinc Concentrate [Member] |  |
Sales by geographical area | 23,792 | 25,652
Sales by significant product type | 23,792 | 25,652
Bulk Concentrate [Member] |  |
Sales by geographical area | 6,100 | 5,616
Sales by significant product type | 6,100 | 5,616
CANADA |  |
Sales by geographical area | 92,872 | 88,668
Sales by significant product type | 92,872 | 88,668
KOREA, REPUBLIC OF |  |
Sales by geographical area | 49,300 | 32,703
Sales by significant product type | 49,300 | 32,703
JAPAN |  |
Sales by geographical area | 8,350 | 13,773
Sales by significant product type | 8,350 | 13,773
UNITED STATES |  |
Sales by geographical area | 4,571 | 4,081
Sales by significant product type | 4,571 | 4,081
Other Geographic Areas [Member] |  |
Sales by geographical area |  | (131)
Sales by significant product type |  | $ (131)

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