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Note 1 - Basis of Presentation (Details Textual)		6 Months Ended
	Jun. 12, 2020 USD ($)	Jun. 30, 2021	Jun. 30, 2020
Number of Reportable Segments		2	1
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities		2
OR21, LLC [Member]
Equity Method Investment, Ownership Percentage		50.00%
Gamma Knife Center Ecuador S.A. (GKCE) [Member]
Noncontrolling Interest, Ownership Percentage by Parent		99.30%
Gamma Knife Center Ecuador S.A. (GKCE) [Member]
Business Combination, Consideration Transferred, Total	$ 2,000,000
Payments to Acquire Businesses, Gross	575,000
Business Combination, Consideration Transferred, Liabilities Incurred	1,425,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	$ 883,000
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers		14
GK Financing, LLC (GKF) [Member] | Gamma Knife Center Ecuador S.A. (GKCE) [Member]
Business Acquisition, Percentage of Voting Interests Acquired	98.00%
GK Financing, LLC (GKF) [Member] | Gamma Knife Units [Member]
Number of Medical Centers		13
Architectural Design Company [Member] | OR21, LLC [Member]
Equity Method Investment, Ownership Percentage		50.00%

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