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Note 1 - Business and Basis of Presentation (Details Textual) | Dec. 31, 2022 | Apr. 27, 2022
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Newco [Member] |  |
Equity Method Investment, Ownership Percentage |  | 85.00%
OR21, LLC [Member] |  |
Equity Method Investment, Ownership Percentage | 50.00% |
Guadalupe [Member] | Newco [Member] |  |
Equity Method Investment, Ownership Percentage |  | 15.00%
Architectural Design Company [Member] | OR21, LLC [Member] |  |
Equity Method Investment, Ownership Percentage | 50.00% |
Gamma Knife Center Ecuador S.A. (GKCE) [Member] | Gamma Knife Units [Member] |  |
Number of Medical Centers | 12 |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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