The Southern California Regional Gamma Knife Center (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 01, 2016 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Payment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Feb. 29, 2016 USD ($)
The Southern California Regional Gamma Knife Center [Abstract]
Renovation installation and operation agreement period				14 years
Lease payment				$ 0	$ 89,000
Condensed Income Statement Information [Abstract]
Patient revenue		$ 0	$ 0	0	1,061,000
Net (loss) income		(378,000)	(352,000)	(2,167,000)	(677,000)
USNC's equity in earnings (loss)		(156,000)	(77,000)	(1,287,000)	(351,000)
Condensed Balance Sheet Information [Abstract]
Current assets		703,000		703,000		$ 2,243,000
TOTAL ASSETS		1,209,000		1,209,000		3,688,000
Current liabilities		336,000		336,000		626,000
Equity		862,000		862,000		3,028,000
TOTAL LIABILITIES AND EQUITY		1,209,000		1,209,000		3,688,000
Neuro Partners LLC and CGK [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Recorded amount of equity method income (loss)				0		(10,000)
Condensed Income Statement Information [Abstract]
Patient revenue		(36,000)	127,000	242,000	463,000
Net (loss) income		(188,000)	(15,000)	(215,000)	12,000
Condensed Balance Sheet Information [Abstract]
Current assets		226,000		226,000		299,000
Noncurrent assets		358,000		358,000		294,000
TOTAL ASSETS		584,000		584,000		593,000
Current liabilities		942,000		942,000		564,000
Noncurrent liabilities		0		0		0
Equity		(358,000)		(358,000)		29,000
TOTAL LIABILITIES AND EQUITY		$ 584,000		$ 584,000		593,000
Neuro Partners LLC [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage		20.00%		20.00%
Neuro Partners LLC [Member] | Lease One [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Share of guarantee in lease obligations				20.00%
Lease term		7 years		7 years
Lease obligation							$ 668,000
Neuro Partners LLC [Member] | Lease Two [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Lease term		5 years		5 years
Lease obligation							$ 1,663,000
Number of lease payments | Payment				60
Lease payment	$ 31,000
CGK [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage		39.00%		39.00%
Due to related parties		$ 8,000		$ 8,000
Due from related parties						$ 6,000
Neuro Partners LLC and CGK [Member]
Condensed Income Statement Information [Abstract]
USNC's equity in earnings (loss)		$ (83,000)	$ (15,000)	$ (110,000)	$ (22,000)