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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