Medical Oncology Partners (Details) - USD ($)		3 Months Ended		9 Months Ended
	Dec. 31, 2016	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 23, 2016
Medical Oncology Partners [Abstract]
Carrying value of investment		$ 152,000		$ 152,000		$ 141,000
Advances to unconsolidated entities				496,000	$ 359,000
Condensed Consolidated Income Statement Information [Abstract]
Patient revenue		0	$ 0	0	1,061,000
Net loss		(378,000)	(352,000)	(2,167,000)	(677,000)
USNC's equity in (loss) income		(156,000)	(77,000)	(1,287,000)	(351,000)
Condensed Consolidated 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
Deficit		862,000		862,000		3,028,000
TOTAL LIABILITIES AND EQUITY		1,209,000		1,209,000		3,688,000
MOP [Member]
Condensed Consolidated Income Statement Information [Abstract]
Patient revenue		439,000	532,000	1,488,000	1,601,000
Net loss		(340,000)	(185,000)	(588,000)	(280,000)
Condensed Consolidated Balance Sheet Information [Abstract]
Current assets		136,000		136,000		201,000
Noncurrent assets		162,000		162,000		384,000
TOTAL ASSETS		298,000		298,000		585,000
Current liabilities		3,449,000		3,449,000		3,109,000
Noncurrent liabilities		50,000		50,000		92,000
Deficit		(3,201,000)		(3,201,000)		(2,616,000)
TOTAL LIABILITIES AND EQUITY		298,000		$ 298,000		$ 585,000
MOP [Member]
Medical Oncology Partners [Abstract]
Equity interest percentage to be acquired by subsidiary				100.00%
Investments in unconsolidated entities				$ 450,000
Advances to unconsolidated entities				259,000	342,000
Condensed Consolidated Income Statement Information [Abstract]
USNC's equity in (loss) income	$ (12,000)	(121,000)	$ (66,000)	(211,000)	$ (100,000)
MOP [Member] | Other Investor [Member]
Medical Oncology Partners [Abstract]
Investments in unconsolidated entities				105,000
MOP [Member] | USNC [Member]
Medical Oncology Partners [Abstract]
Investments in unconsolidated entities				173,000
Ownership percentage							35.83%
Carrying value of investment		$ 149,000		149,000			$ 161,000
MOP [Member] | USNC [Member] | Dr. Jaime Lozano [Member]
Medical Oncology Partners [Abstract]
Investments in unconsolidated entities				$ 345,000
Ownership percentage		76.67%		76.67%
Percentage of equity interest to an additional investor as a consulting fee for services				5.00%