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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Note 1 - Basis of Presentation (Details Textual)		3 Months Ended		6 Months Ended
Note 1 - Basis of Presentation (Details Textual)	May 07, 2024 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 28, 2024	Apr. 09, 2021 USD ($)
Number of Medical Centers	1	7		7
Number of Single-unit Facilities	3	2		2
Lessee, Operating Lease, Term of Contract (Year)						10 years
Number of Reportable Segments				2
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities		2		2
MEXICO
Number of Single-unit Facilities		1		1
The Credit Agreement [Member] \| Fifth Third Bank, N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity										$ 22,000,000
Debt Instrument, Covenant, Minimum Unrestricted Cash							$ 5,000,000
GKCE [Member]
Accounts Receivable, after Allowance for Credit Loss		$ 7,466,000	$ 6,657,000	$ 7,466,000	$ 6,657,000	$ 8,138,000		$ 6,073,000
RI Companies [Member]
Number of Single-unit Facilities	3
Business Combination, Voting Equity Interest Acquired, Percentage	60.00%
Business Combination, Consideration Transferred	$ 2,850,000
RI Companies [Member] \| Minimum [Member]
Business Combination, Net Payment Terms (Year)	30 years
RI Companies [Member] \| Maximum [Member]
Business Combination, Net Payment Terms (Year)	60 years
Rental Income from Medical Services [Member]
Revenue from Contract with Customer, Including Assessed Tax		3,545,000	3,571,000	6,565,000	6,562,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax		2,346,000	1,921,000	4,302,000	3,563,000
Direct Patient Services [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 4,885,000	$ 3,500,000	$ 8,949,000	$ 6,621,000
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
Newco Guadalajara [Member]
Equity Method Investment, Ownership Percentage									70.00%
Percentage of Site Modifications									50.00%
Newco Guadalajara [Member] \| HSJ [Member]
Equity Method Investment, Ownership Percentage									30.00%