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
Feb. 29, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Amortization of Intangible Assets   $ 541,000 $ 683,000  
Intangible Assets, Net (Excluding Goodwill)   3,629,000   $ 4,070,000
Finite-Lived Intangible Assets, Gross   20,531,000   20,431,000
Finite-Lived Intangible Assets, Accumulated Amortization   16,902,000   $ 16,361,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   243,000 $ 144,000  
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      
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   $ 900,000    
Minehut [Member] | Maximum [Member]        
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 1,000,000