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Note 1 - Basis of Presentation (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Apr. 27, 2022
Number of Reportable Segments			2
GKCE [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 652,000		$ 652,000		$ 862,000
Newco [Member]
Equity Method Investment, Ownership Percentage						85.00%
OR21, LLC [Member]
Equity Method Investment, Ownership Percentage	50.00%		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%		50.00%
Gamma Knife Center Ecuador S.A. (GKCE) [Member] | Gamma Knife Units [Member]
Number of Medical Centers	12		12
Rental Income from Medical Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 4,812,000	$ 4,140,000	$ 9,041,000	$ 8,281,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,545,000	2,308,000	4,859,000	4,347,000
Patient Income [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 756,000	$ 894,000	$ 1,452,000	$ 1,600,000
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers	13		13
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities	2		2

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