Quarterly report [Sections 13 or 15(d)]

Note 3 - Intangible Assets (Details Textual)

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Note 3 - Intangible Assets (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 19 Months Ended
May 19, 2025
Feb. 29, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Feb. 26, 2024
Amortization of Intangible Assets     $ 513,000 $ 610,000 $ 1,594,000 $ 1,896,000      
Intangible Assets, Net (Excluding Goodwill)     2,361,000   2,361,000   $ 2,361,000 $ 4,070,000  
Finite-Lived Intangible Assets, Gross     20,316,000   20,316,000   20,316,000 20,431,000  
Finite-Lived Intangible Assets, Accumulated Amortization     17,955,000   17,955,000   17,955,000 $ 16,361,000  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     0 0 343,000 144,000      
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 $ 0 $ 0 $ 343,000 $ 0      
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