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Note 5 - Leases (Details Textual) |  |  |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 13 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2025 USD ($) | Nov. 30, 2024 USD ($) ft² | May 07, 2024 USD ($) ft² | Nov. 03, 2021 USD ($) ft² | Feb. 28, 2025 USD ($) | Mar. 31, 2025 USD ($) ft² a | Mar. 31, 2024 USD ($) | Jul. 31, 2024 USD ($) m² | Jan. 31, 2024 USD ($) ft² | Dec. 31, 2024 USD ($)
Operating Lease, Liability |  |  |  |  |  | $ 3,749,000 |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | 3,064,000 |  |  |  | $ 1,015,000
Sublease Income |  |  |  |  |  | $ 15,000 | $ (0) |  |  |
Lessee, Operating Lease, Discount Rate |  |  |  |  |  | 8.00% |  |  |  |
Unfavorable Leasehold Interest |  |  |  |  |  | $ 685,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Remaining Lease Term (Year) |  |  |  |  |  | 9 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Remaining Lease Term (Year) |  |  |  |  |  | 16 years |  |  |  |
Related Party [Member] |  |  |  |  |  |  |  |  |  |
Sublease Income |  |  |  |  |  | $ 15,000 | $ 0 |  |  |
Condominium Space for Gamma Knife Facility in Guayaquil, Ecuador [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  |  |  | 864 |  |  |  |
Land and Parking Spaces for Gamma Knife Facility in Guayaquil, Ecuador [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | a |  |  |  |  |  | 10,135 |  |  |  |
RI Companies [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 60.00% |  |  |  |  |  |  |
Number of Single-unit Facilities |  |  | 3 |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Units |  |  | 2 |  |  |  |  |  |  |
Lease Agreement for New Corporate Office [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  | 900 |  |  |  |  |  |
Operating Lease, Monthly Expense |  |  |  | $ 4,500 |  |  |  |  |  |
Small Office Sublease in San Francisco [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  | 80 |  |  |  |  |  |  |  |
Operating Lease, Monthly Expense |  | $ 1,003 |  |  |  |  |  |  |  |
Operating Lease, Liability |  | 15,000 |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 15,000 |  |  |  |  |  |  |  |
Small Office Sublease in Downers Grove [Member] |  |  |  |  |  |  |  |  |  |
Operating Lease, Monthly Expense |  |  |  |  | $ 2,300 |  |  |  |  |
Operating Lease, Liability |  |  |  |  | 26,000 |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 26,000 |  |  |  |  |
Clinic Space in Woonsocket, RI [Member] | RI Companies [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 1,950 |  |  |  |  |  |  |
Woonsocket Ground Lease [Member] | RI Companies [Member] |  |  |  |  |  |  |  |  |  |
Operating Lease, Annual Prepayment |  |  | $ 44,000 |  |  |  |  |  |  |
Facility in Warwick, RI [Member] | RI Companies [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 10,236 |  |  |  |  |  |  |
Operating Lease, Monthly Expense | $ 26,443 |  | $ 32,790 |  |  |  |  |  |  |
Operating Lease, Liability | 2,071,000 |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 2,071,000 |  |  |  |  |  |  |  |  |
Stand-alone Facility in Lima, Peru [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  |  |  |  |  |  |  | 1,600 |
Operating Lease, Monthly Expense |  |  |  |  |  |  |  |  | $ 8,850 |
Radiation Therapy Facility in Puebla, Mexico [Member] |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) | m² |  |  |  |  |  |  |  | 536 |  |
Operating Lease, Monthly Expense |  |  |  |  |  |  |  | $ 1,800 |  |
Operating Lease, Liability |  |  |  |  |  |  |  | 149,000 |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  | $ 149,000 |  |

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