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Boca Oncology Partners (Details)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
Boca Oncology Partners (Details)	Jun. 30, 2012	Jun. 30, 2011 USD ($)	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Condensed Income Statement Information [Abstract]
USNC's equity in (loss) earnings of FOP			$ (513,000)	$ (160,000)	$ (746,000)	$ (190,000)
USNC [Member] \| Boca West IMP [Member]
Boca Oncology Partners [Abstract]
Share of guarantee in mortgage			10.00%		10.00%
Share of guarantee in outstanding mortgage			50.00%		50.00%
Mortgage term of guarantee					10 years
Original balance of mortgage			$ 3,000,000		$ 3,000,000
Outstanding balance on mortgage			$ 2,262,000		$ 2,262,000		$ 2,303,000
Boca Oncology Partners, LLC [Member]
Boca Oncology Partners [Abstract]
Area of real estate property (in square foot) \| ft²			6,000		6,000
Boca Oncology Partners RE, LLC ("BOPRE") [Member]
Boca Oncology Partners [Abstract]
Ownership percentage			21.22%		21.22%		21.22%
Investments in unconsolidated entities					$ 168,000		$ 168,000
Condensed Income Statement Information [Abstract]
Rental income			$ 0	0	0	0
Net loss			0	(4,000)	0	(4,000)
USNC's equity in (loss) earnings of FOP			0	$ (1,000)	0	$ (1,000)
Condensed Balance Sheet Information [Abstract]
Current assets			25,000		25,000		18,000
Noncurrent assets			928,000		928,000		935,000
Total assets			953,000		953,000		953,000
Current liabilities			0		0		0
Noncurrent liabilities			0		0		0
Equity			953,000		953,000		953,000
Total liabilities and equity (deficit)			$ 953,000		$ 953,000		$ 953,000
Boca Oncology Partners RE, LLC ("BOPRE") [Member] \| Boca West IMP [Member]
Boca Oncology Partners [Abstract]
Percentage of interest in medical office building		20.00%
Ownership percentage	23.75%
Additional investor purchased ownership percentage	3.75%
BOP and BOPRE [Member]
Boca Oncology Partners [Abstract]
Area of real estate property (in square foot) \| ft²			32,000		32,000
Ownership percentage		22.50%
Investments in unconsolidated entities		$ 225,000