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Note 6 - Leases (Details Textual) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 03, 2021 USD ($) ft² | Dec. 01, 2021 USD ($) | Dec. 31, 2022 USD ($) ft² | Dec. 31, 2021 USD ($)
Operating Lease, Right-of-Use Asset |  |  | $ 317,000 | $ 654,000
Operating Lease, Liability, Total |  |  | 351,000 | 351,000
Operating Lease, Expense |  |  | $ 290,000 | 377,000
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) | ft² |  |  | 10,135 |
Minimum [Member] |  |  |  |
Lessee, Operating Lease, Discount Rate |  |  | 4.00% |
Lessee, Operating Lease, Remaining Lease Term (Year) |  |  | 1 year |
Maximum [Member] |  |  |  |
Lessee, Operating Lease, Discount Rate |  |  | 6.00% |
Lessee, Operating Lease, Remaining Lease Term (Year) |  |  | 2 years |
Sublease Office in San Francisco, California [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 3,253 |  | 3,253 |
Operating Lease, Monthly Expense | $ 22,011 |  | $ 22,011 |
Lessee, Operating Sublease, Monthly Income | $ 16,195 |  | $ 16,195 |
Operating Lease, Impairment Loss |  | $ 77,000 |  |
Lease Agreement for New Corporate Office [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² | 900 |  |  |
Operating Lease, Monthly Expense | $ 4,500 |  |  |
Operating Lease, Right-of-Use Asset |  | $ 151,000 |  |
Corporate Office in San Francisco [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 900 |
Operating Lease, Monthly Expense |  |  | $ 4,500 |
Stand-alone Facility in Lima, Peru [Member] |  |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 1,600 |
Operating Lease, Monthly Expense |  |  | $ 8,850 |
Operating Lease, Impairment Loss |  |  |  | $ 77,000

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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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