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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Cash and cash equivalents | $ 98,669 |  |  | $ 62,452 |  |  |
Other current assets | 136,487 |  |  | 116,672 |  |  |
Properties, plants, equipment and mineral interests, net | 2,342,038 |  |  | 2,423,698 |  |  |
Intercompany receivable (payable) | 0 |  |  | 0 |  |  |
Investments in subsidiaries | 0 |  |  | 0 |  |  |
Other non-current assets | 37,956 |  |  | 34,486 |  |  |
Total assets | 2,615,150 |  | $ 2,615,150 | 2,637,308 |  |  |
Current liabilities | 125,391 |  |  | 116,974 |  |  |
Long-term debt | 512,077 |  |  | 522,761 |  |  |
Accrued reclamation and closure costs | 100,072 |  |  | 103,793 |  |  |
Non-current deferred tax liability | 129,506 |  |  | 138,282 |  |  |
Other non-current liabilities | 54,456 |  |  | 63,075 |  |  |
Shareholders' equity | 1,693,648 | $ 1,658,693 |  | 1,692,423 | $ 1,616,644 | $ 1,639,228 | $ 1,690,963
Total liabilities and shareholders' equity | 2,615,150 |  |  | 2,637,308 |  |  |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |  |  |  |
Cash and cash equivalents | 54,986 |  |  | 33,750 |  |  |
Other current assets | 7,670 |  |  | 9,725 |  |  |
Properties, plants, equipment and mineral interests, net | 1,913 |  |  | 1,913 |  |  |
Intercompany receivable (payable) | (46,498) |  |  | (28,381) |  |  |
Investments in subsidiaries | 1,665,459 |  |  | 1,636,802 |  |  |
Other non-current assets | 286,403 |  |  | 289,422 |  |  |
Total assets | 1,969,933 |  |  | 1,943,231 |  |  |
Current liabilities | 268,234 |  |  | 309,293 |  |  |
Long-term debt | 495,839 |  |  | 504,729 |  |  |
Accrued reclamation and closure costs | 0 |  |  | 0 |  |  |
Non-current deferred tax liability | 0 |  |  | 0 |  |  |
Other non-current liabilities | 48,680 |  |  | 55,372 |  |  |
Shareholders' equity | 1,693,648 |  |  | 1,692,423 |  |  |
Total liabilities and shareholders' equity | 1,969,933 |  |  | 1,943,231 |  |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |
Cash and cash equivalents | 27,180 |  |  | 15,357 |  |  |
Other current assets | 121,535 |  |  | 89,722 |  |  |
Properties, plants, equipment and mineral interests, net | 2,331,450 |  |  | 2,410,458 |  |  |
Intercompany receivable (payable) | (508,931) |  |  | (579,830) |  |  |
Investments in subsidiaries | 0 |  |  | 0 |  |  |
Other non-current assets | 25,194 |  |  | 24,325 |  |  |
Total assets | 1,996,428 |  |  | 1,960,032 |  |  |
Current liabilities | (175,677) |  |  | (155,441) |  |  |
Long-term debt | 16,000 |  |  | 17,271 |  |  |
Accrued reclamation and closure costs | 93,530 |  |  | 96,389 |  |  |
Non-current deferred tax liability | 163,581 |  |  | 166,549 |  |  |
Other non-current liabilities | 4,737 |  |  | 6,577 |  |  |
Shareholders' equity | 1,542,903 |  |  | 1,517,805 |  |  |
Total liabilities and shareholders' equity | 1,996,428 |  |  | 1,960,032 |  |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |
Cash and cash equivalents | 16,503 |  |  | 13,345 |  |  |
Other current assets | 7,356 |  |  | 17,299 |  |  |
Properties, plants, equipment and mineral interests, net | 8,675 |  |  | 11,327 |  |  |
Intercompany receivable (payable) | 216,536 |  |  | 216,632 |  |  |
Investments in subsidiaries | 0 |  |  | 0 |  |  |
Other non-current assets | (117,489) |  |  | (121,981) |  |  |
Total assets | 131,581 |  |  | 136,622 |  |  |
Current liabilities | (1,206) |  |  | (8,334) |  |  |
Long-term debt | 238 |  |  | 761 |  |  |
Accrued reclamation and closure costs | 6,542 |  |  | 7,404 |  |  |
Non-current deferred tax liability | 0 |  |  | 0 |  |  |
Other non-current liabilities | 1,039 |  |  | 1,126 |  |  |
Shareholders' equity | 122,556 |  |  | 118,997 |  |  |
Total liabilities and shareholders' equity | 131,581 |  |  | 136,622 |  |  |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  | 0 |  |  |
Other current assets | (74) |  |  | (74) |  |  |
Properties, plants, equipment and mineral interests, net | 0 |  |  | 0 |  |  |
Intercompany receivable (payable) | 338,893 |  |  | 391,579 |  |  |
Investments in subsidiaries | (1,665,459) |  |  | (1,636,802) |  |  |
Other non-current assets | (156,152) |  |  | (157,280) |  |  |
Total assets | (1,482,792) |  |  | (1,402,577) |  |  |
Current liabilities | (216,742) |  |  | (262,492) |  |  |
Long-term debt | 0 |  |  | 0 |  |  |
Accrued reclamation and closure costs | 0 |  |  | 0 |  |  |
Non-current deferred tax liability | (34,075) |  |  | (28,267) |  |  |
Other non-current liabilities | 0 |  |  | 0 |  |  |
Shareholders' equity | (1,665,459) |  |  | (1,636,802) |  |  |
Total liabilities and shareholders' equity | $ (1,482,792) |  |  | $ (1,402,577) |  |  |

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