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Note 1 - Basis of Presentation (Details Textual)	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Apr. 27, 2022
Number of Reportable Segments	2
GKCE [Member] | Related Party [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 764,000		$ 862,000
Newco [Member]
Equity Method Investment, Ownership Percentage				85.00%
OR21, LLC [Member]
Equity Method Investment, Ownership Percentage	50.00%
Guadalupe [Member] | Newco [Member]
Equity Method Investment, Ownership Percentage				15.00%
Architectural Design Company [Member] | OR21, LLC [Member]
Equity Method Investment, Ownership Percentage	50.00%
Gamma Knife Center Ecuador S.A. (GKCE) [Member] | Gamma Knife Units [Member]
Number of Medical Centers	12
Rental Income from Medical Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 4,229,000	$ 4,141,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,314,000	2,039,000
Patient Income [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 696,000	$ 706,000
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers	13
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities	2

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