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Segment Reporting (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of geographic regions | segment 3    
Balance sheet information      
Total current assets $ 46,099 $ 58,915  
Total non-current assets 158,072 156,847  
Total assets 204,171 215,762  
Total current liabilities 24,682 29,659  
Total non-current liabilities 67,725 65,353  
Total shareholders' equity 111,764 120,750 $ 90,538
Total liabilities and shareholders' equity 204,171 215,762  
Income statement information      
Sales, net 138,724 125,196  
Total mine cost of sales 108,976 88,449  
Exploration expenses 13,049 4,886  
Total other costs and expenses 14,461 14,218  
Provision for income taxes 8,559 9,615  
Net income (loss) (6,321) 8,028  
Oaxaca, Mexico      
Income statement information      
Exploration expenses 4,244 4,831  
Michigan, USA      
Income statement information      
Exploration expenses 8,805 55  
Operating Segments | Oaxaca, Mexico      
Balance sheet information      
Total current assets 38,032 50,057  
Total non-current assets 63,342 66,756  
Total assets 101,374 116,813  
Total current liabilities 20,035 25,833  
Total non-current liabilities 5,533 1,436  
Total shareholders' equity 75,806 89,544  
Total liabilities and shareholders' equity 101,374 116,813  
Income statement information      
Sales, net 138,724 125,196  
Total mine cost of sales 108,863 88,449  
Exploration expenses 4,244 4,813  
Total other costs and expenses 2,741 3,995  
Provision for income taxes 8,061 8,518  
Net income (loss) 14,815 19,421  
Operating Segments | Michigan, USA      
Balance sheet information      
Total current assets 272 5,528  
Total non-current assets 92,927 90,018  
Total assets 93,199 95,546  
Total current liabilities 3,352 2,459  
Total non-current liabilities 60,648 63,438  
Total shareholders' equity 29,199 29,649  
Total liabilities and shareholders' equity 93,199 95,546  
Income statement information      
Total mine cost of sales 75    
Exploration expenses 8,805 55  
Total other costs and expenses 1,415 1,167  
Provision for income taxes (1,123) 305  
Net income (loss) (9,172) (1,527)  
Corporate and Other      
Balance sheet information      
Total current assets 7,795 3,330  
Total non-current assets 1,803 73  
Total assets 9,598 3,403  
Total current liabilities 1,295 1,367  
Total non-current liabilities 1,544 479  
Total shareholders' equity 6,759 1,557  
Total liabilities and shareholders' equity 9,598 3,403  
Income statement information      
Total mine cost of sales 38    
Exploration expenses   18  
Total other costs and expenses 10,305 9,056  
Provision for income taxes 1,621 792  
Net income (loss) $ (11,964) $ (9,866)