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Note 4 - Loans (Details) - Secured Loans Past Maturity (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of loans(1)(2) 3rmiviii_LoansReceivableNumberOfLoansMatured  
Principal $ 76,742,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 71,017,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Advances 847,000us-gaap_OtherReceivables 726,000us-gaap_OtherReceivables
Accrued interest(3) 629,000us-gaap_InterestReceivable 294,000us-gaap_InterestReceivable
Loan balance 69,397,000us-gaap_LoansReceivableNet 63,551,000us-gaap_LoansReceivableNet
Percent of principal 100.00%rmiviii_LoansReceivablePercentOfTotal 100.00%rmiviii_LoansReceivablePercentOfTotal
Past Maturity [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of loans(1)(2) 3rmiviii_LoansReceivableNumberOfLoansMatured
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		 [1],[2] 4rmiviii_LoansReceivableNumberOfLoansMatured
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		 [1],[2]
Principal 17,073,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		 17,316,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember
Advances 837,000us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		 719,000us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember
Accrued interest(3) 226,000us-gaap_InterestReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		  
Loan balance $ 18,136,000us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		 $ 18,035,000us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember
Percent of principal 22.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember		 24.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= rmiviii_PastMaturityMember
[1] The secured loans past maturity include two and four loans as of March 31, 2015 and December 31, 2014, respectively, which are also included in the secured loans in non-accrual status.
[2] The secured loans past maturity include three and four loans as of March 31, 2015 and December 31, 2014, respectively, which are also included in the secured loans delinquency.