Note 2 - Property and Equipment (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Income (Loss) Attributable to Parent, Total	$ 497,000	$ (87,000)	$ 766,000	$ (58,000)
Earnings Per Share, Diluted, Total (in dollars per share)	$ 0.08	$ (0.01)	$ 0.12	$ (0.01)
Non-US [Member]
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total	$ 2,448,000		$ 2,448,000
Salvage Value [Member]
Net Income (Loss) Attributable to Parent, Total	$ 114,000	$ 114,000	$ 228,000	$ 114,000
Earnings Per Share, Diluted, Total (in dollars per share)	$ 0.02	$ 0.02	$ 0.04	$ 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