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Note 1 - Basis of Presentation (Details Textual)			3 Months Ended
Note 1 - Basis of Presentation (Details Textual)	Feb. 06, 2025 USD ($)	May 07, 2024 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	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
Number of Single-unit Facilities		3	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
MEXICO
Number of Single-unit Facilities			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			$ 8,484,000	$ 6,120,000	$ 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			3,020,000	2,991,000
PBRT Services [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,956,000	1,642,000
Direct Patient Services [Member]
Revenue from Contract with Customer, Including Assessed Tax			$ 4,064,000	$ 3,121,000
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers			8
Single-Unit Radiation Therapy Facilities [Member]
Number of Single-unit Facilities			3
Bristol [Member]
Payments to Acquire Real Estate	$ 1,185,000
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%