The Southern California Regional Gamma Knife Center (Details)		3 Months Ended			12 Months Ended
	Apr. 01, 2016 USD ($)	Mar. 31, 2022 USD ($) Payment	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	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	1,061,000
Net (loss) income		(495,000)	292,000	$ 292,000
USNC's equity in earnings (loss)		(133,000)	(139,000)
Condensed Balance Sheet Information [Abstract]
Current assets		1,705,000			$ 2,243,000
TOTAL ASSETS		3,180,000			3,688,000
Current liabilities		624,000			327,000
Equity		2,533,000			3,327,000
TOTAL LIABILITIES AND EQUITY		3,180,000			3,688,000
Neuro Partners LLC and CGK [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Recorded amount of equity method income		0			10,000
Condensed Income Statement Information [Abstract]
Patient revenue		122,000	166,000
Net (loss) income		(30,000)	19,000
Condensed Balance Sheet Information [Abstract]
Current assets		368,000			299,000
Noncurrent assets		230,000			294,000
TOTAL ASSETS		598,000			593,000
Current liabilities		598,000			564,000
Noncurrent liabilities		0			0
Equity		0			29,000
TOTAL LIABILITIES AND EQUITY		$ 598,000			593,000
Neuro Partners LLC [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage		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
Lease obligation						$ 668,000
Neuro Partners LLC [Member] | Lease Two [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Lease term		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%
Due from related parties		$ 19,000			$ 6,000
Neuro Partners LLC and CGK [Member]
Condensed Income Statement Information [Abstract]
USNC's equity in earnings (loss)		$ 10,000	$ (2,000)