Quarterly report [Sections 13 or 15(d)]

Note 3 - Intangible Assets (Details Textual)

v3.25.2
Note 3 - Intangible Assets (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 16 Months Ended
May 19, 2025
Feb. 29, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Amortization of Intangible Assets     $ 540,000 $ 604,000 $ 1,081,000 $ 1,286,000    
Intangible Assets, Net (Excluding Goodwill)     2,849,000   2,849,000   $ 2,849,000 $ 4,070,000
Finite-Lived Intangible Assets, Gross     20,291,000   20,291,000   20,291,000 20,431,000
Finite-Lived Intangible Assets, Accumulated Amortization     17,442,000   17,442,000   17,442,000 $ 16,361,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     100,000 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 $ 100,000 $ 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