Florida Oncology Partners (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Aug. 31, 2011
Schedule of Equity Method Investments [Line Items]
Outstanding lease obligation	$ 5,060,255		$ 5,060,255
Recorded investments	283,000		283,000		471,000
Florida Oncology Partners LLC Condensed Income Statement Information [Abstract]
USNC's equity in loss of Neuro Partners LLC			24,000	0
Florida Oncology Partners RE, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Recorded investments	40,000		40,000
Florida Oncology Partners [Member]
Schedule of Equity Method Investments [Line Items]
Recorded investments	200,000		200,000		200,000
Ownership percentage by outside investors (in hundredths)			80.00%
Florida Oncology Partners, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Recorded investments	160,000		160,000
Notes receivable from related parties						200,000
Notes receivable interest rate (in hundredths)				10.00%
Notes receivable including accrued interest					208,000
Outstanding Loan	1,534,275		1,534,275
Monthly payment of loan			8,500
Loan, Frequency of Periodic Payment			monthly
Maturity Date of loan			Jun. 15, 2022
Number of Monthly Installment			120
Florida Oncology Partners LLC Condensed Income Statement Information [Abstract]
Net sales	839,000	465,000	2,322,000	1,110,000
Net income	178,000	390,000	364,000	86,000
USNC's equity in loss of Neuro Partners LLC	36,000	78,000	73,000	17,000
Florida Oncology Partners LLC Condensed Balance Sheet Information [Abstract]
Current assets	1,076,000		1,076,000		1,297,000
Noncurrent assets	5,115,000		5,115,000		5,467,000
Total assets	6,191,000		6,191,000		6,764,000
Current liabilities	968,000		968,000		905,000
Noncurrent liabilities	4,416,000		4,416,000		4,944,000
Equity	807,000		807,000		915,000
Total liabilities and equity	$ 6,191,000		$ 6,191,000		$ 6,764,000
Florida Oncology Partners, LLC [Member] | USNC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in hundredths)	20.00%		20.00%
Percentage of guarantee obligations (in hundredths)			20.00%