Note 6 - Investment in Juanicipio - Associate's Financial Position (Details) - Minera Juanicipio, S.A. de C.V. [member] - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]    
Cash and cash equivalents $ 18,972 $ 51,503
Value added tax and other receivables 25,580 26,055
Concentrate sales receivable from Fresnillo 18,853 5,203
Inventory 3,234 427
Prepaids and other assets 104 0
TOTAL CURRENT ASSETS 66,743 83,188
Right-of-use assets 2,052 18
Mineral interests, plant and equipment 644,609 381,780
Deferred tax assets 5,254 0
Total assets 718,658 464,986
Payables to Peñoles and other vendors 22,835 3,713
Total current liabilities 22,835 3,713
Interest payable to shareholders 4,279 1,298
Lease liabilities 2,053 13
Provisions 4,070 1,450
Deferred tax liabilities 31,266 8,406
Total liabilities 64,503 14,880
Shareholders equity including shareholder advances 654,155 450,106
TOTAL LIABILITIES $ 718,658 $ 464,986