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Note 1 - Basis of Presentation (Details Textual)			3 Months Ended
	May 14, 2024 USD ($)	Nov. 10, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Jan. 01, 2024 USD ($)	Jan. 01, 2023 USD ($)	Apr. 27, 2022
Number of Medical Centers			10
Number of Reportable Segments			2
GKCE [Member]
Accounts Receivable, after Allowance for Credit Loss			$ 1,882,000	$ 1,058,000	$ 1,626,000	$ 1,021,000
Rental Income from Medical Services [Member]
Revenue from Contract with Customer, Including Assessed Tax			4,253,000	4,229,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax			2,649,000	2,314,000
Direct Patient Services [Member]
Revenue from Contract with Customer, Including Assessed Tax			$ 963,000	$ 696,000
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers			11
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities			2
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member]
Business Combination, Consideration Transferred	$ 175,000	$ 2,850,000
Business Acquisition, Percentage of Voting Interests Acquired		60.00%
Business Acquisition, Transaction Costs			$ 322,000
Newco [Member]
Equity Method Investment, Ownership Percentage							85.00%
Newco [Member] | Guadalupe [Member]
Equity Method Investment, Ownership Percentage							15.00%
OR21, LLC [Member]
Equity Method Investment, Ownership Percentage			50.00%
OR21, LLC [Member] | Architectural Design Company [Member]
Equity Method Investment, Ownership Percentage			50.00%

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