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Borrowings - Senior Notes (Details) (USD $)
0 Months Ended
Mar. 22, 2011
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Senior notes   $ 85,937,000us-gaap_SeniorLongTermNotes $ 83,867,000us-gaap_SeniorLongTermNotes
Post-Modification Notes [Member]      
Debt Instrument [Line Items]      
Senior notes   85,900,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
83,900,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
Senior Notes [Member] | Post-Modification Notes [Member]      
Debt Instrument [Line Items]      
Face amount of debt 85,900,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior Notes [Member] | Post-Modification Notes [Member] | Interest Rate, Pre-Trigger [Member]      
Debt Instrument [Line Items]      
Interest rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ novc_InterestRateModificationAxis
= novc_InterestRatePreTriggerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior Notes [Member] | Post-Modification Notes [Member] | Modification Trigger, One [Member]      
Debt Instrument [Line Items]      
Proceeds from equity offering, minimum 40,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ novc_InterestRateModificationAxis
= novc_ModificationTriggerOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior Notes [Member] | Post-Modification Notes [Member] | Interest Rate, Post-Trigger [Member]      
Debt Instrument [Line Items]      
Variable rate, description three-month LIBOR    
Basis spread on variable rate 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ novc_InterestRateModificationAxis
= novc_InterestRatePostTriggerMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Restriction Release Trigger, One [Member] | Senior Notes [Member] | Post-Modification Notes [Member]      
Debt Instrument [Line Items]      
Tangible net worth, minimum $ 40,000,000novc_DebtInstrumentTangibleNetWorthMinimum
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ novc_RestrictiveCovenantsConditionsNecessaryToRemoveRestrictionsAxis
= novc_RestrictionReleaseTriggerOneMember
   
Restriction Release Trigger, Two [Member] | Senior Notes [Member] | Post-Modification Notes [Member]      
Debt Instrument [Line Items]      
Interest coverage ratio, minimum 1.35novc_DebtInstrumentInterestCoverageRatioMinimum
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ novc_RestrictiveCovenantsConditionsNecessaryToRemoveRestrictionsAxis
= novc_RestrictionReleaseTriggerTwoMember
   
Leverage ratio, maximum 95.00%novc_DebtInstrumentLeverageRatioMaximum
/ us-gaap_DebtInstrumentAxis
= novc_PostModificationNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ novc_RestrictiveCovenantsConditionsNecessaryToRemoveRestrictionsAxis
= novc_RestrictionReleaseTriggerTwoMember