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Note 1 - Business Description and Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 06, 2025
USD ($)
Dec. 31, 2024
USD ($)
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation $ 3,737,000 $ 5,619,000 $ 3,737,000 $ 5,619,000   $ 4,965,000
Certificates of Deposit, at Carrying Value 500,000 500,000 500,000 500,000   $ 500,000
Stock-based Advisory Fees 84,000   $ 84,000      
Number of Operating Segments     2      
Number of Reportable Segments     2      
Crypto Asset, Unrealized Gain (Loss), Nonoperating (1,517,000) $ 0 $ (1,486,000) $ 0    
Crypto Asset, Realized Gain (Loss), Operating and Nonoperating 0   0      
Bittensor (TAO) Staking Rewards [Member]            
Crypto Asset, Fair Value 6,610,000   6,610,000      
Crypto Asset, Staking Activity 97,000   99,000      
Crypto Asset, Staking Activity, Cost 8,000   9,000      
Prefunded Warrants [Member]            
Class of Warrant or Right, Issuance Costs         $ 375,000  
Warrants and Rights Outstanding, Term (Month)         12 months  
Stock-based Advisory Fees 84,000   84,000      
Class of Warrant or Right, Remaining Issuance Costs $ 291,000   $ 291,000      
G P Communications [Member]            
Subsidiary, Ownership Percentage, Parent 100.00%   100.00%