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Note 2 - Property and Equipment (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Depreciation $ 1,242,000 $ 1,163,000 $ 2,609,000 $ 2,375,000
Write Down of Impaired Assets and Associated Removal Costs 578,000 0 578,000 0
Net Income (Loss) Attributable to Parent $ (111,000) $ 497,000 $ 77,000 $ 766,000
Earnings Per Share, Diluted (in dollars per share) $ (0.02) $ 0.08 $ 0.01 $ 0.12
Salvage Value [Member]        
Net Income (Loss) Attributable to Parent $ (50,000)   $ (101,000)  
Earnings Per Share, Diluted (in dollars per share) $ 0.01   $ 0.02  
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  
PBRT Equipment [Member]        
Property, Plant and Equipment, Useful Life (Year) 20 years   20 years