Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,053,000	$ 1,414,000
Accounts receivable	277,000us-gaap_AccountsReceivableNetCurrent	0us-gaap_AccountsReceivableNetCurrent
Due from related parties	8,000us-gaap_DueFromRelatedPartiesCurrent	316,000us-gaap_DueFromRelatedPartiesCurrent
Elekta Refund Due	115,000usnu_ElektaRefundDue	0usnu_ElektaRefundDue
Other current assets	72,000us-gaap_OtherAssetsCurrent	30,000us-gaap_OtherAssetsCurrent
Total current assets	1,525,000us-gaap_AssetsCurrent	1,760,000us-gaap_AssetsCurrent
Investment in unconsolidated entities	323,000us-gaap_EquityMethodInvestments	320,000us-gaap_EquityMethodInvestments
Capital lease asset under construction	0us-gaap_CapitalLeasedAssetsGross	2,949,000us-gaap_CapitalLeasedAssetsGross
Gamma knife (net of accumulated depreciation of $475,000 in 2014)	3,960,000usnu_GammaKnifeNet	0usnu_GammaKnifeNet
Leasehold improvements (net of accumulated amortization of $197,000 in 2014)	1,643,000us-gaap_LeaseholdImprovementsGross	0us-gaap_LeaseholdImprovementsGross
Total property and equipment	5,603,000us-gaap_PropertyPlantAndEquipmentNet	2,949,000us-gaap_PropertyPlantAndEquipmentNet
TOTAL ASSETS	7,451,000us-gaap_Assets	5,029,000us-gaap_Assets
Current liabilities:
Obligations under capital lease - current portion	821,000	265,000
Deferred tax liability- current portion	92,000us-gaap_DeferredTaxLiabilitiesCurrent	0us-gaap_DeferredTaxLiabilitiesCurrent
Accounts payable and accrued expenses	96,000	154,000
Deferred revenue	48,000us-gaap_DeferredRevenueCurrent	0us-gaap_DeferredRevenueCurrent
Due to related parties	13,000us-gaap_DueToRelatedPartiesCurrent	0us-gaap_DueToRelatedPartiesCurrent
Total current liabilities	1,070,000us-gaap_LiabilitiesCurrent	419,000us-gaap_LiabilitiesCurrent
Obligations under capital lease - net of current portion	3,838,000	3,209,000
Deferred tax liability - net of current portion	150,000	0
Asset retirement obligations	431,000	0
Total liabilities	5,489,000us-gaap_Liabilities	3,628,000us-gaap_Liabilities
Commitments and contingencies
STOCKHOLDERS' EQUITY
Common stock - par value $.01; 25,000,000 shares authorized; 7,797,185 shares issued and outstanding at December 31, 2014 and 2013.	78,000us-gaap_CommonStockValue	78,000us-gaap_CommonStockValue
Additional paid-in capital	3,100,000	3,100,000
Accumulated deficit	(1,216,000)	(1,777,000)
Total stockholders' equity	1,962,000us-gaap_StockholdersEquity	1,401,000us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 7,451,000	$ 5,029,000

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant