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 25 Months Ended
May 19, 2025
Feb. 29, 2024
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Dec. 31, 2025
Feb. 26, 2024
Intangible Asset, Finite-Lived, Amortization Expense     $ 539,000 $ 541,000      
Cost, Amortization     6,000 0      
Intangible Asset, Excluding Goodwill, after Accumulated Amortization     1,623,000   $ 1,623,000 $ 1,785,000  
Intangible Asset, Finite-Lived, before Accumulated Amortization     20,612,000   20,612,000 20,229,000  
Intangible Asset, Finite-Lived, Accumulated Amortization     18,989,000   18,989,000 $ 18,444,000  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     $ 0 243,000      
Mineville [Member]              
Intangible Asset, Excluding Goodwill, after Accumulated Amortization $ 350,000            
Minehut [Member]              
Intangible Asset, Excluding Goodwill, after Accumulated Amortization             $ 475,000
Intangible Asset, Finite-Lived, before Accumulated Amortization   $ 1,671,000          
Intangible Asset, Finite-Lived, 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   $ 243,000      
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