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Note 1 - Basis of Presentation (Details Textual)				3 Months Ended		8 Months Ended	9 Months Ended
Note 1 - Basis of Presentation (Details Textual)	Feb. 06, 2025 USD ($)	May 07, 2024 USD ($)	Nov. 10, 2023 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jan. 01, 2025 USD ($)	Jun. 28, 2024	Jan. 01, 2024 USD ($)	Apr. 27, 2022
Number of Medical Centers				7			7
Number of Reportable Segments							2
GKCE [Member]
Accounts Receivable, after Allowance for Credit Loss				$ 7,981,000	$ 5,357,000		$ 7,981,000	$ 5,357,000	$ 6,073,000		$ 1,626,000
MEXICO
Number of Medical Centers				1			1
Number of Single-unit Facilities				1			1
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities				2			2
Bristol [Member]
Payments to Acquire Real Estate	$ 1,185,000
Newco [Member] \| Guadalupe [Member]
Equity Method Investment, Ownership Percentage												85.00%
Newco Guadalajara [Member]
Equity Method Investment, Ownership Percentage										70.00%		15.00%
Percentage of Site Modifications										50.00%
Newco Guadalajara [Member] \| HSJ [Member]
Equity Method Investment, Ownership Percentage										30.00%
OR21, LLC [Member]
Equity Method Investment, Ownership Percentage					50.00%			50.00%
OR21, LLC [Member] \| Architectural Design Company [Member]
Equity Method Investment, Ownership Percentage					50.00%			50.00%
Southern New England Regional Cancer Center, LLC and Roger Williams Radiation Therapy, LLC [Member]
Number of Medical Centers			3
Business Combination, Consideration Transferred		$ 5,125,000	$ 2,850,000			$ 4,925,000
Business Acquisition, Percentage of Voting Interests Acquired			60.00%
Number of Functional Radiation Therapy Cancer Centers			3
RI Companies [Member]
Number of Single-unit Facilities		3
Business Acquisition, Percentage of Voting Interests Acquired		60.00%
RI Companies [Member] \| Minimum [Member]
Business Combination, Net Payment Terms (Day)		30 days
RI Companies [Member] \| Maximum [Member]
Business Combination, Net Payment Terms (Day)		60 days
Gamma Knife Units [Member]
Number of Single-unit Facilities				2			2
Rental Income from Medical Services [Member]
Revenue from Contract with Customer, Including Assessed Tax				$ 3,137,000	$ 3,312,000		$ 9,699,000	$ 11,464,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax				2,127,000	2,316,000		5,691,000	7,386,000
Direct Patient Services [Member]
Revenue from Contract with Customer, Including Assessed Tax				$ 4,034,000	$ 3,687,000		$ 10,655,000	$ 7,807,000
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers				8			8
Single-Unit Radiation Therapy Facilities [Member]
Number of Single-unit Facilities				3			3