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STOCK BASED COMPENSATION (Detail Textuals) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jul. 15, 2014
Apr. 16, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 37us-gaap_ShareBasedCompensation $ 3us-gaap_ShareBasedCompensation    
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 9 years      
Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 9 years      
2014 Stock Option and Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized to be issued under plan       150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= rivr_StockOptionAndIncentivePlan2014Member
2014 Stock Option and Incentive Plan | Directors and Officers | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted stock granted     30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= rivr_StockOptionAndIncentivePlan2014Member
/ us-gaap_TitleOfIndividualAxis
= rivr_DirectorsAndOfficersMember
 
2014 Stock Option and Incentive Plan | Directors and Officers | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock options granted     30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= rivr_StockOptionAndIncentivePlan2014Member
/ us-gaap_TitleOfIndividualAxis
= rivr_DirectorsAndOfficersMember