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Note 6 - Other Non-current Assets (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Other Assets, Noncurrent [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Permitting costs(1) |  | $ | 8,110 |  |  | $ | 7,644 |
Enterprise resource planning system, net |  |  | — |  |  |  | 354 |
Rio Grande Site Lease initial direct costs |  |  | 16,456 |  |  |  | 13,314 |
Total other non-current assets, net |  | $ | 24,566 |  |  | $ | 21,312 |

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