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STOCK BASED COMPENSATION (Details Textual) (USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2015
May 27, 2014
Mar. 31, 2015
Mar. 31, 2014
Disclosure of equity incentive plan [Line Items]        
Stock Options And Restricted Stock Awards Percentage For Fair Value     20.00%nvsl_StockOptionsAndRestrictedStockAwardsPercentageForFairValue  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 6 months 6 years 6 months 6 years 6 months  
Restricted Stock [Member]        
Disclosure of equity incentive plan [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     31,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Stock Options And Restricted Stock [Member]        
Disclosure of equity incentive plan [Line Items]        
Allocated Share-based Compensation Expense     26,500us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= nvsl_StockOptionsAndRestrictedStockMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= nvsl_StockOptionsAndRestrictedStockMember
Stock Options [Member]        
Disclosure of equity incentive plan [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     640,800us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember