Boca Oncology Partners (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013 sqft	Jun. 30, 2012	Jun. 30, 2013 sqft	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Percentage of interest in medical office building (in hundredths)			20.00%
Investment in BOP and BOPRE	$ 308,000		$ 308,000			$ 246,000
BOP and BOPRE Condensed Income Statement Information [Abstract]
Patient revenue	0	469,000	0	1,064,000
USNC's equity in income (loss)	19,000	6,000	12,000	(15,000)
USNC [Member]
Schedule of Equity Method Investments [Line Items]
Reduced ownership percentage (in hundredths)			11.25%
Boca Oncology Partners, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Area of building (in square feet)	6,000		6,000
Amount loaned to related parties			56,250
Company loan interest rate (in hundredths)	7.00%		7.00%
Debt maturity period			5 years
Boca Oncology Partners, LLC [Member] | USNC [Member]
Schedule of Equity Method Investments [Line Items]
Amount loaned to related parties			28,000
Boca West IMP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in hundredths)	3.75%		3.75%
Boca Oncology Partners RE, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in hundredths)	15.40%		15.40%
Ownership percentage by outside investors (in hundredths)			31.50%
Boca Oncology Partners RE, LLC [Member] | USNC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in hundredths)	11.25%		11.25%
BOP and BOPRE [Member]
Schedule of Equity Method Investments [Line Items]
Area of building (in square feet)	32,000		32,000
Investment in BOP and BOPRE	111,000		111,000		225,000
Ownership percentage (in hundredths)					22.50%
Additional investor purchased (in hundredths)			50.00%		20.00%
Ownership percentage by outside investors (in hundredths)			88.75%
BOP and BOPRE Condensed Income Statement Information [Abstract]
Patient revenue	600,000	0	1,119,000	0
Net income (loss)	(102,000)	(71,000)	(94,000)	(144,000)
USNC's equity in income (loss)	(11,000)	(8,000)	(11,000)	(16,000)
BOP and BOPRE Condensed Balance Sheet Information [Abstract]
Current assets	115,000		115,000			289,000
Noncurrent assets	2,681,000		2,681,000			2,897,000
Total assets	2,796,000		2,796,000			3,186,000
Current liabilities	127,000		127,000			308,000
Noncurrent liabilities	2,253,000		2,253,000			2,368,000
Equity	416,000		416,000			510,000
Total liabilities and equity	$ 2,796,000		$ 2,796,000			$ 3,186,000
BOP and USNC's [Member]
Schedule of Equity Method Investments [Line Items]
Reduced ownership percentage (in hundredths)			15.40%