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Note 4 - Loans (Details) - Secured Loans by Lien Position in the Collateral (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Note 4 - Loans (Details) - Secured Loans by Lien Position in the Collateral [Line Items]    
Loans 53us-gaap_MortgageLoansOnRealEstateNumberOfLoans 48us-gaap_MortgageLoansOnRealEstateNumberOfLoans
Loans - principal (in Dollars) $ 76,742,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 71,017,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Loans - percent 100.00%rmiviii_LoansReceivablePercentOfTotal 100.00%rmiviii_LoansReceivablePercentOfTotal
Liens due other lenders at loan closing (in Dollars) 28,441,000rmiviii_LoansReceivableLiensDueOtherLendersAtLoanClosing 27,744,000rmiviii_LoansReceivableLiensDueOtherLendersAtLoanClosing
Total debt (in Dollars) 105,183,000rmiviii_LoansReceivableTotalDebt 98,761,000rmiviii_LoansReceivableTotalDebt
Appraised property value at loan closing (in Dollars) 205,272,000rmiviii_LoansReceivableAppraisedPropertyValueAtLoanClosing 185,332,000rmiviii_LoansReceivableAppraisedPropertyValueAtLoanClosing
Percent of total debt to appraised values (LTV) at loan closing(1) 51.24%rmiviii_LoansReceivablePercentOfTotalDebtToAppraisedValueAtLoanClosing [1] 53.29%rmiviii_LoansReceivablePercentOfTotalDebtToAppraisedValueAtLoanClosing [1]
First Trust Deeds [Member]    
Note 4 - Loans (Details) - Secured Loans by Lien Position in the Collateral [Line Items]    
Loans 33us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_FirstTrustDeedsMember		 29us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_FirstTrustDeedsMember
Loans - principal (in Dollars) 61,643,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_FirstTrustDeedsMember		 58,169,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_FirstTrustDeedsMember
Loans - percent 80.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_FirstTrustDeedsMember		 82.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_FirstTrustDeedsMember
Second Trust Deeds [Member]    
Note 4 - Loans (Details) - Secured Loans by Lien Position in the Collateral [Line Items]    
Loans 19us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_SecondTrustDeedsMember		 18us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_SecondTrustDeedsMember
Loans - principal (in Dollars) 14,819,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_SecondTrustDeedsMember		 12,566,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_SecondTrustDeedsMember
Loans - percent 19.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_SecondTrustDeedsMember		 17.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_SecondTrustDeedsMember
Third Trust Deeds [Member]    
Note 4 - Loans (Details) - Secured Loans by Lien Position in the Collateral [Line Items]    
Loans 1us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_ThirdTrustDeedsMember		 1us-gaap_MortgageLoansOnRealEstateNumberOfLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_ThirdTrustDeedsMember
Loans - principal (in Dollars) $ 280,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_ThirdTrustDeedsMember		 $ 282,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_ThirdTrustDeedsMember
Loans - percent 1.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_ThirdTrustDeedsMember		 1.00%rmiviii_LoansReceivablePercentOfTotal
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rmiviii_ThirdTrustDeedsMember
[1] Based on appraised values and liens due other lenders at loan closing. The loan to value computation does not take into account subsequentincreases or decreases in security property values following the loan closing nor does it include decreases or increases of the amount owing onsenior liens to other lenders by payments or interest accruals, if any. Property values likely have changed, particularly over the last four years, andthe portfolio's current loan to value ratio likely is higher than this historical ratio.