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Note 2 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Net Income (Loss) Attributable to Parent $ (17,000) $ (207,000) $ (922,000) $ 3,514,000  
Earnings Per Share, Diluted (in dollars per share) $ (0) $ (0.03) $ (0.14) $ 0.54  
Medical and Office Equipment [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year) 3 years   3 years    
Medical and Office Equipment [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year) 10 years   10 years    
Gamma Knife Units [Member]          
Property, Plant, and Equipment, Salvage Value         $ 0
Gamma Knife Units [Member] | Salvage Value [Member]          
Net Income (Loss) Attributable to Parent $ (10,000)   $ (103,000)    
Earnings Per Share, Diluted (in dollars per share) $ 0   $ 0.01    
PBRT Equipment [Member]          
Property, Plant and Equipment, Useful Life (Year) 20 years   20 years