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Segment Reporting (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Number of geographic regions | segment     3          
Balance sheet information                
Total current assets $ 39,962   $ 39,962     $ 46,099    
Total non-current assets 151,110   151,110     158,072    
Total assets 191,072   191,072     204,171    
Total current liabilities 19,115   19,115     24,682    
Total non-current liabilities 65,256   65,256     67,725    
Total shareholders' equity 106,701 $ 126,002 106,701 $ 126,002 $ 110,991 111,764 $ 123,715 $ 120,750
Total liabilities and shareholders' equity 191,072   191,072     204,171    
Income statement information                
Sales, net 24,807 37,064 56,035 82,481        
Total mine cost of sales, including depreciation 26,976 29,045 54,275 55,139        
Exploration expenses 1,440 2,837 3,279 5,142        
Total other costs and expenses, including G&A 2,848 (1,272) 6,107 6,376        
(Benefit) provision for income taxes (1,873) 3,781 (2,007) 9,132        
Net income (loss) (4,584) 2,673 (5,619) 6,692        
Oaxaca, Mexico                
Income statement information                
Exploration expenses 1,045 810 2,434 2,047        
Michigan, USA                
Income statement information                
Exploration expenses 395 2,027 845 3,095        
Operating Segments | Oaxaca, Mexico                
Balance sheet information                
Total current assets 34,487   34,487     38,032    
Total non-current assets 56,445   56,445     63,342    
Total assets 90,932   90,932     101,374    
Total current liabilities 14,601   14,601     20,035    
Total non-current liabilities 3,446   3,446     5,533    
Total shareholders' equity 72,885   72,885     75,806    
Total liabilities and shareholders' equity 90,932   90,932     101,374    
Income statement information                
Sales, net 24,807 37,064 56,035 82,481        
Total mine cost of sales, including depreciation 26,376 28,995 53,036 55,089        
Exploration expenses 1,045 810 2,434 2,047        
Total other costs and expenses, including G&A 72 (3,568) 703 1,124        
(Benefit) provision for income taxes (1,612) 3,518 (1,562) 8,869        
Net income (loss) (1,074) 7,309 1,424 15,352        
Operating Segments | Michigan, USA                
Balance sheet information                
Total current assets 150   150     272    
Total non-current assets 92,948   92,948     92,927    
Total assets 93,098   93,098     93,199    
Total current liabilities 2,502   2,502     3,352    
Total non-current liabilities 60,823   60,823     60,648    
Total shareholders' equity 29,773   29,773     29,199    
Total liabilities and shareholders' equity 93,098   93,098     93,199    
Income statement information                
Total mine cost of sales, including depreciation 28 33 42 33        
Exploration expenses 395 2,027 845 3,095        
Total other costs and expenses, including G&A (30) 121 214 438        
(Benefit) provision for income taxes (215)   (437)          
Net income (loss) (178) (2,181) (664) (3,566)        
Corporate and Other                
Balance sheet information                
Total current assets 5,325   5,325     7,795    
Total non-current assets 1,717   1,717     1,803    
Total assets 7,042   7,042     9,598    
Total current liabilities 2,012   2,012     1,295    
Total non-current liabilities 987   987     1,544    
Total shareholders' equity 4,043   4,043     6,759    
Total liabilities and shareholders' equity 7,042   7,042     $ 9,598    
Income statement information                
Total mine cost of sales, including depreciation 572 17 1,197 17        
Total other costs and expenses, including G&A 2,806 2,175 5,190 4,814        
(Benefit) provision for income taxes (46) 263 (8) 263        
Net income (loss) $ (3,332) $ (2,455) $ (6,379) $ (5,094)