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Note 3 - Revision of Previously Issued Financial Statements for Immaterial Misstatements (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] |
|  | As of and for the Year Ended December 31, 2020 |
(in thousands, except per share amounts) |  | As Previously Reported |  |  | Adjustment |  |  | As Revised |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Inventories: Concentrates, doré, and stockpiled ore |  | $ | 57,936 |  |  | $ | (369 | ) |  | $ | 57,567 |
Total current assets |  |  | 284,681 |  |  |  | (369 | ) |  |  | 284,312 |
Properties, plants, equipment and mineral interests, net |  |  | 2,345,219 |  |  |  | 32,855 |  |  |  | 2,378,074 |
Total assets |  |  | 2,667,724 |  |  |  | 32,486 |  |  |  | 2,700,210 |
Accrued taxes |  |  | 8,349 |  |  |  | (2,575 | ) |  |  | 5,774 |
Total current liabilities |  |  | 149,785 |  |  |  | (2,575 | ) |  |  | 147,210 |
Deferred tax liability |  |  | 132,475 |  |  |  | 23,616 |  |  |  | 156,091 |
Total liabilities |  |  | 965,384 |  |  |  | 21,041 |  |  |  | 986,425 |
Accumulated deficit |  |  | (379,519 | ) |  |  | 11,445 |  |  |  | (368,074 | )
Total shareholders' equity |  |  | 1,702,340 |  |  |  | 11,445 |  |  |  | 1,713,785 |
Total liabilities and shareholders' equity |  |  | 2,667,724 |  |  |  | 32,486 |  |  |  | 2,700,210 |
Consolidated Statements of Operations and Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and other direct production costs |  |  | 389,040 |  |  |  | (6,377 | ) |  |  | 382,663 |
Depreciation, depletion and amortization |  |  | 157,130 |  |  |  | (9,020 | ) |  |  | 148,110 |
Total cost of sales |  |  | 546,170 |  |  |  | (15,397 | ) |  |  | 530,773 |
Gross profit |  |  | 145,703 |  |  |  | 15,397 |  |  |  | 161,100 |
Income from operations |  |  | 51,581 |  |  |  | 15,397 |  |  |  | 66,978 |
Loss before income and mining taxes |  |  | (16,655 | ) |  |  | 15,397 |  |  |  | (1,258 | )
Income and mining tax provision |  |  | (135 | ) |  |  | (8,064 | ) |  |  | (8,199 | )
Net loss |  |  | (16,790 | ) |  |  | 7,333 |  |  |  | (9,457 | )
Loss applicable to common shareholders |  |  | (17,342 | ) |  |  | 7,333 |  |  |  | (10,009 | )
Comprehensive loss |  |  | (12,369 | ) |  |  | 7,333 |  |  |  | (5,036 | )
Basic loss per common share after preferred dividends |  |  | (0.03 | ) |  |  | 0.01 |  |  |  | (0.02 | )
Diluted loss per common share after preferred dividends |  |  | (0.03 | ) |  |  | 0.01 |  |  |  | (0.02 | )
Consolidated Statements of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (16,790 | ) |  |  | 7,333 |  |  |  | (9,457 | )
Depreciation, depletion and amortization |  |  | 164,026 |  |  |  | (9,020 | ) |  |  | 155,006 |
Deferred income taxes |  |  | (5,505 | ) |  |  | 1,687 |  |  |  | (3,818 | )
Cash provided by operating activities |  |  | 180,793 |  |  |  | — |  |  |  | 180,793 |
|  | As of and for the Year Ended December 31, 2019 |
(in thousands, except per share amounts) |  | As Previously Reported |  |  | Adjustment |  |  | As Revised |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |
Inventories: Concentrates, doré, and stockpiled ore |  | $ | 30,364 |  |  | $ | (286 | ) |  | $ | 30,078 |
Total current assets |  |  | 179,124 |  |  |  | (286 | ) |  |  | 178,838 |
Properties, plants, equipment and mineral interests, net |  |  | 2,423,698 |  |  |  | 23,752 |  |  |  | 2,447,450 |
Total assets |  |  | 2,637,308 |  |  |  | 23,466 |  |  |  | 2,660,774 |
Deferred tax liability |  |  | 138,282 |  |  |  | 19,355 |  |  |  | 157,637 |
Total liabilities |  |  | 944,885 |  |  |  | 19,355 |  |  |  | 964,240 |
Accumulated deficit |  |  | (353,331 | ) |  |  | 4,111 |  |  |  | (349,220 | )
Total shareholders' equity |  |  | 1,692,423 |  |  |  | 4,111 |  |  |  | 1,696,534 |
Total liabilities and shareholders' equity |  |  | 2,637,308 |  |  |  | 23,466 |  |  |  | 2,660,774 |
Consolidated Statements of Operations and Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and other direct production costs |  | $ | 450,349 |  |  | $ | (2,364 | ) |  | $ | 447,985 |
Depreciation, depletion and amortization |  |  | 199,518 |  |  |  | (8,067 | ) |  |  | 191,451 |
Total cost of sales |  |  | 649,867 |  |  |  | (10,431 | ) |  |  | 639,436 |
Gross profit |  |  | 23,399 |  |  |  | 10,431 |  |  |  | 33,830 |
Loss from operations |  |  | (57,109 | ) |  |  | 10,431 |  |  |  | (46,678 | )
Loss before income and mining taxes |  |  | (123,658 | ) |  |  | 10,431 |  |  |  | (113,227 | )
Income and mining tax benefit |  |  | 24,101 |  |  |  | (5,783 | ) |  |  | 18,318 |
Net loss |  |  | (99,557 | ) |  |  | 4,648 |  |  |  | (94,909 | )
Loss applicable to common shareholders |  |  | (100,109 | ) |  |  | 4,648 |  |  |  | (95,461 | )
Comprehensive loss |  |  | (94,398 | ) |  |  | 4,648 |  |  |  | (89,750 | )
Basic loss per common share after preferred dividends |  |  | (0.20 | ) |  |  | 0.01 |  |  |  | (0.19 | )
Diluted loss per common share after preferred dividends |  |  | (0.20 | ) |  |  | 0.01 |  |  |  | (0.19 | )
Consolidated Statements of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (99,557 | ) |  |  | 4,648 |  |  |  | (94,909 | )
Depreciation, depletion and amortization |  |  | 204,475 |  |  |  | (8,067 | ) |  |  | 196,408 |
Deferred income taxes |  |  | (33,387 | ) |  |  | 3,419 |  |  |  | (29,968 | )
Cash provided by operating activities |  |  | 120,866 |  |  |  | — |  |  |  | 120,866 |

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