CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Gamma Knife, accumulated depreciation	$ 1,737,000	$ 1,372,000
Leasehold improvement, accumulated amortization	$ 152,000	$ 134,000

The cumulative amount of amortization related to leasehold improvements that has been recognized in the income statement.

No definition available.

Name:	usnu_LeaseholdImprovementsAccumulatedAmortization
Namespace Prefix:	usnu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant