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Note 5 - Leases (Details Textual) |  |  |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended | 13 Months Ended |  |
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Jan. 01, 2025 USD ($) | Nov. 30, 2024 USD ($) ft² | May 07, 2024 USD ($) ft² | Nov. 03, 2021 USD ($) ft² | Feb. 28, 2025 USD ($) | May 31, 2024 USD ($) a | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jul. 31, 2024 USD ($) m² | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jan. 31, 2024 USD ($) ft² | Mar. 31, 2025 ft² a | Dec. 31, 2024 USD ($)
Operating Lease, Liability |  |  |  |  |  |  | $ 4,432,000 |  |  | $ 4,432,000 |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  | 3,750,000 |  |  | 3,750,000 |  |  |  | $ 1,015,000
Sublease Income |  |  |  |  |  |  | $ 15,000 | $ 15,000 |  | $ 45,000 | $ 24,000 |  |  |
Lessee, Operating Lease, Discount Rate |  |  |  |  |  |  | 8.00% |  |  | 8.00% |  |  |  |
Unfavorable Leasehold Interest |  |  |  |  |  |  | $ 631,000 |  |  | $ 631,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Remaining Lease Term (Year) |  |  |  |  |  |  | 9 years |  |  | 9 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Remaining Lease Term (Year) |  |  |  |  |  |  | 16 years |  |  | 16 years |  |  |  |
Related Party [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sublease Income |  |  |  |  |  |  | $ 15,000 | $ 15,000 |  | $ 45,000 | $ 24,000 |  |  |
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 | 1,922,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 1,922,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stand-alone Facility in Lima, Peru [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Real Estate Property (Square Foot) |  |  |  |  |  | 7,704 |  |  |  |  |  | 1,600 |  |
Operating Lease, Monthly Expense |  |  |  |  |  | $ 9,000 |  |  |  |  |  | $ 8,850 |  |
Operating Lease, Liability |  |  |  |  |  | 789,000 |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | $ 789,000 |  |  |  |  |  |  |  |
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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