Annual report [Section 13 and 15(d), not S-K Item 405]

Note 4 - Intangible and Other Assets (Details Textual)

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Note 4 - Intangible and Other Assets (Details Textual) - USD ($)
 12 Months Ended 22 Months Ended
May 19, 2025
Feb. 29, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Feb. 26, 2024
Amortization of Intangible Assets     $ 2,176,000 $ 2,544,000    
Intangible Assets, Net (Excluding Goodwill)     1,785,000 4,070,000 $ 1,785,000  
Finite-Lived Intangible Assets, Gross     20,229,000 20,431,000 20,229,000  
Finite-Lived Intangible Assets, Accumulated Amortization     18,444,000 16,361,000 18,444,000  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     343,000 183,000    
Mineville [Member]            
Intangible Assets, Net (Excluding Goodwill) $ 350,000          
Minehut [Member]            
Intangible Assets, Net (Excluding Goodwill)           $ 475,000
Finite-Lived Intangible Assets, Gross   $ 1,671,000        
Finite-Lived Intangible Assets, Accumulated Amortization   1,196,000        
Mineville [Member]            
Ownership Percentage 100.00%          
Disposal Group, Including Discontinued Operation, Consideration $ 350,000          
Mineville [Member] | Maximum [Member]            
Percent of Revenue 60.00%          
Revenues $ 1,500,000          
Mineville [Member] | Minimum [Member]            
Percent of Revenue 50.00%          
Minehut [Member]            
Disposal Group, Including Discontinued Operation, Consideration   619,000        
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   144,000 $ 343,000 $ 39,000    
Disposal Group, Including Discontinued Operation, Consideration, Receivable   619,000        
Royalty Income, Nonoperating         $ 1,000,000  
Minehut [Member] | Maximum [Member]            
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ 1,000,000