CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 80,000us-gaap_NetIncomeLoss	$ (106,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	238,000	0
Loss from investment in unconsolidated entities, net	36,000usnu_IncomeLossFromInvestments	39,000usnu_IncomeLossFromInvestments
Gain from sale of investments in unconsolidated entities	0usnu_IncomeFromUnconsolidatedEntites	(205,000)usnu_IncomeFromUnconsolidatedEntites
Accretion of asset retirement obligations	17,000	0
Amortization of guarantee liability	2,000usnu_AmortizationOfGuaranteeLiability	0usnu_AmortizationOfGuaranteeLiability
Deferred income taxes	48,000us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in:
Accounts receivable	(361,000)	0
Other current assets	22,000	3,000
Accounts payable and accrued expenses	18,000	37,000
Deferred revenue	159,000	0
Net cash provided by (used in) operating activities	259,000	(232,000)
Cash flows from investing activities:
Proceeds from sale of investments	0	156,000
Purchase of leasehold improvements	0us-gaap_PaymentsForCapitalImprovements	(301,000)us-gaap_PaymentsForCapitalImprovements
(Increase in) decrease of due from related parties	(61,000)	198,000
Net cash (used in) provided by investing activities	(61,000)	53,000
Cash flows from financing activities:
Repayment of capital lease obligations	(147,000)	0
Proceeds from short-term loans	0us-gaap_ProceedsFromShortTermDebt	462,000us-gaap_ProceedsFromShortTermDebt
Net cash (used in) provided by financing activities	(147,000)	462,000
Net change in cash and cash equivalents	51,000	283,000
Cash and cash equivalents - beginning of period	1,053,000	1,414,000
Cash and cash equivalents - end of period	1,104,000	1,697,000
Cash paid for
Interest	54,000us-gaap_InterestPaid	13,000us-gaap_InterestPaid
Supplemental disclosure of of noncash investing and financing activities:
Purchase of gamma knife and related leasehold improvements included in accounts payable	341,000	139,000
Increase in investment in unconsolidated entities through recording of guarantee liability	22,000	0
Increase in guarantee liability recorded	$ 13,000	$ 0

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