Note 14 - Related Party Transactions - Incurred Expenses With Cascabel and IMDEX (Details) - Cascabel and IMDEX [member] - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Statement Line Items [Line Items] | ||
| Exploration and marketing services | $ 436 | $ 505 |
| Travel and expenses | 29 | 12 |
| Administration for Mexican subsidiaries | 54 | 54 |
| Field exploration services | 167 | 160 |
| Expenses incurred for related parties | $ 686 | $ 731 |