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Note 11 - Subsequent Events (Details Textual)
3 Months Ended
Apr. 13, 2026
USD ($)
shares
Apr. 01, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
Apr. 13, 2026
₪ / shares
Dec. 22, 2025
$ / shares
Mar. 31, 2025
$ / shares
Jun. 26, 2022
$ / shares
Proceeds from Issuance or Sale of Equity | $     $ 2,750,000        
Series F Convertible Preferred Stock [Member]              
Preferred Stock, Stated Value Per Share (in dollars per share)     $ 1,000       $ 1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share)         $ 0.9615    
Series F Convertible Preferred Stock [Member] | Minimum [Member]              
Preferred Stock, Convertible, Conversion Price (in dollars per share)           $ 2.22  
Series F Convertible Preferred Stock [Member] | Maximum [Member]              
Preferred Stock, Convertible, Conversion Price (in dollars per share)           $ 5.25  
Subsequent Event [Member] | ThirdEye Systems [Member]              
Subsidiary, Ownership Percentage, Parent       51.00%      
Subsequent Event [Member] | ThirdEye Systems [Member] | Ordinary Stock [Member]              
Investment Owned, Shares Acquired (in shares) | shares 3,268,608            
Investment Owned, Shares Acquired, Price per Share (in ILS per share) | ₪ / shares       ₪ 9.27      
Subsequent Event [Member] | ThirdEye Systems [Member] | Rights [Member]              
Investment Owned, Shares Acquired (in shares) | shares 1,618,227            
Investment Owned, Shares Acquired, Price per Share (in ILS per share) | ₪ / shares       ₪ 9.27      
Subsequent Event [Member] | Common Stock Purchase Warrants [Member]              
Stock Issued During Period, Shares, Warrants Exercised (in shares) | shares   400          
Proceeds from Issuance or Sale of Equity | $   $ 1          
Subsequent Event [Member] | Cashless Series F Warrants [Member]              
Stock Issued During Period, Shares, Cashless Warrant Exercises (in shares) | shares   608,839          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.8526          
Subsequent Event [Member] | Minimum [Member] | ThirdEye Systems [Member]              
Payments to Acquire Investments | $ $ 10,000,000            
Subsequent Event [Member] | Maximum [Member] | ThirdEye Systems [Member]              
Payments to Acquire Investments | $ $ 14,950,000            
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member]              
Conversion of Stock, Shares Issued (in shares) | shares   205,254          
Conversion of Stock, Shares Converted (in shares) | shares   175          
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member] | Series F Convertible Preferred Stock [Member]              
Preferred Stock, Stated Value Per Share (in dollars per share)   $ 1,000          
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member] | Series F Convertible Preferred Stock [Member] | Minimum [Member]              
Preferred Stock, Convertible, Conversion Price (in dollars per share)   0.8526          
Subsequent Event [Member] | Conversions of Series F Preferred Stock Into Common Stock [Member] | Series F Convertible Preferred Stock [Member] | Maximum [Member]              
Preferred Stock, Convertible, Conversion Price (in dollars per share)   $ 400,000