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Note 5 - Leases (Details Textual)					1 Months Ended		3 Months Ended		7 Months Ended	9 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 ($)	May 31, 2024 USD ($) 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

X

- Definition

The number of single-unit facilities.

+ References

No definition available.

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+ References

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+ References

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Discount rate used by lessee to determine present value of operating lease payments.

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Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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