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Note 1 - Basis of Presentation (Details Textual) |  |  |  | 3 Months Ended | 8 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |

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