Secured Investor Certificates - Maturity Schedule Secured Investor Certificates (Details) - USD ($)	6 Months Ended		12 Months Ended				126 Months Ended
	Dec. 31, 2019	Jun. 30, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2019	Jun. 30, 2033
Secured Investor Certificate Maturity Schedule		$ 29,106,000
Secured Investor Certificates
Secured Investor Certificate Maturity Schedule	$ 1,530,000		$ 897,000	$ 2,056,000	$ 4,167,000	$ 4,342,000	$ 16,114,000