Note 1 - Basis of Presentation (Details Textual)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Apr. 27, 2022
Increase (Decrease) in Procedure Volumes, Percentage	6.00%	2.00%
Number of Reportable Segments		2
Newco [Member]
Equity Method Investment, Ownership Percentage			85.00%
OR21, LLC [Member]
Equity Method Investment, Ownership Percentage	50.00%	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%	50.00%
Gamma Knife Center Ecuador S.A. (GKCE) [Member] | Gamma Knife Units [Member]
Number of Medical Centers	12	12
Gamma Knife and PBRT Equipment [Member]
Number of Medical Centers	13	13
Lima, Peru and Guayaquil, Ecuador [Member]
Number of Single-unit Facilities	2	2