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Income Taxes (Details 3)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]    
U.S. Federal statutory income tax 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income tax, net of benefits 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Fair value of Derivatives 17.10%nuot_EffectiveTaxRateReconciliationFairValueOfDerivaives (2.90%)nuot_EffectiveTaxRateReconciliationFairValueOfDerivaives
Nondeductible guarantee fees 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Impact of changes in rates (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (12.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Established/reversed tax deferrals (deferred tax liabilities) not thru provision (68.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent (5.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Other (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Valuation allowance for deferred income tax assets 13.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (18.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective income tax rate (0.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations