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Note 4 - Business Segments, Sales of Products and Significant Customers - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net sales |  | $ 807,473 | $ 691,873 | $ 673,266
Net sales |  | 807,473 | 691,873 | 673,266
Income (loss) from operations | [1] | 83,420 | 66,978 | (46,678)
Capital additions (excluding non-cash items |  | 109,048 | 91,016 | 121,421
Depreciation, depletion and amortization: | [1] | 171,793 | 148,110 | 191,451
Other significant non-cash items |  | (6,305) | 12,851 | 9,294
Identifiable assets | [1] | 2,728,808 | 2,700,210 | 2,660,774
Greens Creek [Member] |  |  |  |
Net sales |  | 384,843 | 327,820 | 299,722
Net sales |  | 384,843 | 327,820 | 299,722
Income (loss) from operations | [1] | 164,666 | 114,607 | 87,232
Capital additions (excluding non-cash items |  | 23,883 | 19,685 | 29,570
Depreciation, depletion and amortization: |  | 48,710 | 49,692 | 47,587
Other significant non-cash items |  | 3,653 | 3,103 | 2,868
Identifiable assets |  | 589,944 | 610,360 | 639,047
Lucky Friday [Member] |  |  |  |
Net sales |  | 131,488 | 63,025 | 16,621
Net sales |  | 131,488 | 63,025 | 16,621
Income (loss) from operations |  | 31,683 | (1,711) | (12,520)
Capital additions (excluding non-cash items |  | 29,885 | 25,776 | 8,989
Depreciation, depletion and amortization: |  | 26,846 | 11,473 | 1,175
Other significant non-cash items |  | 1,048 | 881 | 996
Identifiable assets |  | 516,545 | 520,463 | 440,615
Casa Berardi [Member] |  |  |  |
Net sales |  | 245,152 | 209,224 | 192,944
Net sales |  | 245,152 | 209,224 | 192,944
Income (loss) from operations | [1] | 5,807 | 10,379 | (25,432)
Capital additions (excluding non-cash items |  | 49,617 | 40,840 | 36,059
Depreciation, depletion and amortization: | [1] | 80,744 | 60,552 | 65,893
Other significant non-cash items |  | 1,284 | (1,741) | 5,203
Identifiable assets | [1] | 701,868 | 727,008 | 726,977
Nevada Operations [Member] |  |  |  |
Net sales |  | 45,814 | 58,898 | 107,769
Net sales |  | 45,814 | 58,898 | 107,769
Income (loss) from operations |  | (46,115) | (6,674) | (49,224)
Capital additions (excluding non-cash items |  | 5,470 | 4,003 | 42,953
Depreciation, depletion and amortization: |  | 15,341 | 22,845 | 67,024
Other significant non-cash items |  | 7,740 | 2,039 | 2,911
Identifiable assets |  | 468,985 | 513,309 | 528,466
Other Segments [Member] |  |  |  |
Net sales |  | 176 | 32,906 | 56,210
Net sales |  | 176 | 32,906 | 56,210
Income (loss) from operations |  | (72,621) | (49,623) | (46,734)
Capital additions (excluding non-cash items |  | 193 | 712 | 3,850
Depreciation, depletion and amortization: |  | 152 | 3,548 | 9,772
Other significant non-cash items | [1] | (20,030) | 8,569 | (2,684)
Identifiable assets |  | $ 451,466 | $ 329,070 | $ 325,669
[1] | Amounts reported as of and for the years ended December 31, 2020 and 2019 have been revised. See Note 3 for more information.

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