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Note 2 - Property and Equipment (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Income (Loss) Attributable to Parent, Total	$ (87,000)	$ (483,000)	$ (58,000)	$ (618,000)
Earnings Per Share, Diluted, Total (in dollars per share)	$ (0.01)	$ (0.08)	$ (0.01)	$ (0.10)
Non-US [Member]
Property, Plant and Equipment, Net, Ending Balance	$ 2,937,000		$ 2,937,000
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

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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