Broward Oncology Partners (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jan. 31, 2013
Schedule of Equity Method Investments [Line Items]
Recorded investments	$ 295,000		$ 295,000		$ 320,000
Due from related parties	0		0		316,000
Company's proceeds from the sale of BROP [Abstract]
Proceeds from sale			(256,000)	0
Condensed Income Statement Information [Abstract]
Patient revenue	737,000	0	737,000	0
USNC's equity in income of FOP and FOPRE	27,000	19,000	(12,000)	12,000
Broward Oncology Partners, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in hundredths)						12.50%
Recorded investments						50,000
Company's proceeds from the sale of BROP [Abstract]
Proceeds from sale	160,000
Payoff of loans to BROP	60,000
Net proceeds	100,000
Less: Investment in BROP	(67,000)
Gain from sale	33,000
Condensed Income Statement Information [Abstract]
Patient revenue		0	505,000	0
Net income (loss)		(100,000)	255,000	(100,000)
USNC's equity in income of FOP and FOPRE		(13,000)	32,000	(13,000)
Condensed Balance Sheet Information [Abstract]
Current assets					360,000
Noncurrent assets					239,000
Total assets					599,000
Current liabilities					319,000
Equity					280,000
Total liabilities and equity					$ 599,000