Note 2 - Property and Equipment (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Depreciation	$ 1,265,000		$ 1,182,000	$ 3,874,000	$ 3,557,000
Write Down of Impaired Assets and Associated Removal Costs	0	$ 578,000	0	578,000	0
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	$ 578,000
Net Income (Loss) Attributable to Parent	$ 118,000		$ 316,000	$ 195,000	$ 1,082,000
Earnings Per Share, Diluted (in dollars per share)	$ 0.02		$ 0.05	$ 0.03	$ 0.17
Salvage Value [Member]
Net Income (Loss) Attributable to Parent	$ (50,000)			$ 151,000
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