Line of Credit - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Line Of Credit Facility [Line Items]
Pledged Loans Aggregate Principal Amount	$ 23,200,000	$ 21,500,000
Payments of Debt Issuance Costs	57,000	0
Amortization of debt issuance costs	34,000	54,000
Interest expense	$ 574,000	464,000
Ameribor [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, interest rate description	the Ameribor Rate plus three and one-quarter percent (3.25%); and (ii) five percent (5.0%). The fair value of the balance on the line of credit is deemed to approximate the recorded amount because the reference rate plus 3.25% and the other terms and conditions, including the two-year term, of the Revolving Line of Credit and Term Loan Agreement are reflective of market rate terms (Level 2 inputs).
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, maximum amount outstanding during period	$ 10,000,000
Line of credit facility, conversion of outstanding principal balance to term loan of fee	0.25%
Maturity date extended	Mar. 31, 2026
Line of credit facility, description	RMI VIII has the option at the maturity date to convert - for a fee of one-quarter of one percent (0.25%) – the then outstanding principal balance to a two-year term loan maturing in March 2026.
Line of credit facility, interest rate description	per annum rate of the greater of (i) five percent (5%) or (ii) the sum of the one-month LIBOR rate plus three and one-quarter percent (3.25%).
Line of credit facility, interest rate	5.00%
Interest rate, increase (decrease)	0.25%
Line of credit facility, unused line of fee	0.50%
Line of Credit Facility, Commitment Fee Description	there is a quarterly unused line fee equal to one-half of one percent (0.50%) per annum of the average daily difference between the average principal outstanding and fifty percent (50%) of the maximum principal of $10 million.
Maximum allowed advance	$ 10,000,000
Debt issuance costs	57,000
Amortization of debt issuance costs	$ 34,000	$ 54,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, interest rate	3.25%
Revolving Credit Facility [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Minimum compensating balance amount	$ 1,000,000.0
Revolving Credit Facility [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, average rate	50.00%
Line Of Credit [Member]
Line Of Credit Facility [Line Items]
Interest rate, increase (decrease)	7.14%
Minimum tangible net worth	$ 50,000,000
Debt instrument, covenant description	the partnership shall maintain (i) minimum tangible net worth of $50 million, net of amounts due from related companies; (ii) debt service coverage ratio at all times of not less than 2.00 to 1.00;
Line Of Credit [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt service coverage ratio	1.00
Line Of Credit [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Debt service coverage ratio	2.00
Line Of Credit [Member] | Maximum [Member] | Financial Asset, 61 Days Past Due [Member]
Line Of Credit Facility [Line Items]
Delinquency rate	10.00%