Note 2 - Property and Equipment (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Income (Loss) Attributable to Parent, Total	$ 269,000	$ 29,000
Earnings Per Share, Diluted, Total (in dollars per share)	$ 0.04	$ 0.00
Non-US [Member]
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total	$ 2,570,000
Salvage Value [Member]
Net Income (Loss) Attributable to Parent, Total	$ 114,000
Earnings Per Share, Diluted, Total (in dollars per share)	$ 0.02
Medical and Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Medical and Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
PBRT Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years