Organization and Business (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Center	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020	Sep. 02, 2017	Dec. 23, 2016	Dec. 31, 2011	Dec. 31, 2010
Equity Method Investments [Abstract]
Cash reserves | $	$ 2,178,000	$ 2,567,000	$ 2,820,000	$ 2,543,000	$ 2,030,000
Corona Gamma Knife, LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage	39.00%
Neuro Partners LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage	20.00%
Boca Oncology Partners RE, LLC ("BOPRE") [Member]
Equity Method Investments [Abstract]
Ownership percentage	22.50%
Medical Oncology Partners LLC [Member]
Equity Method Investments [Abstract]
Equity interest percentage to be acquired by subsidiary	100.00%
CB Oncology Partners LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage						28.58%	24.00%
NYU [Member]
Equity Method Investments [Abstract]
Number of gamma knife centers owned | Center	1
USNC [Member] | Corona Gamma Knife, LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage	39.00%
USNC [Member] | Neuro Partners LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage	20.00%
USNC [Member] | Florida Oncology Partners, LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage										24.00%
USNC [Member] | Boca Oncology Partners RE, LLC ("BOPRE") [Member]
Equity Method Investments [Abstract]
Ownership percentage									22.51%
USNC [Member] | Medical Oncology Partners LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage								35.83%
USNC [Member] | CB Oncology Partners LLC [Member]
Equity Method Investments [Abstract]
Ownership percentage						28.58%