Real Estate Loans, Notes Receivable, and Lines of Credit Notes and lines of credit (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	$ 18,710,000
Loans and Leases Receivable, Net Amount	9,011,000	$ 10,874,000
Loans and Leases Receivable, Deferred Income	0	0
HCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note Receivable And Line Of Credit Receivable	11,660,000
Loans and Leases Receivable, Net Amount	$ 9,011,000	9,011,000
interest rate note receivable	8.00%
Oxford Capital Partners LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note Receivable And Line Of Credit Receivable	$ 1,250,000
Loans and Leases Receivable, Net Amount	$ 0	1,256,000
interest rate note receivable	10.00%
Mulberry Development Group LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note Receivable And Line Of Credit Receivable	$ 500,000
Loans and Leases Receivable, Net Amount	$ 0	607,000
interest rate note receivable	12.00%
Oxford Capital Partners II LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note Receivable And Line Of Credit Receivable	$ 5,300,000
Loans and Leases Receivable, Net Amount	$ 0	$ 0
interest rate note receivable	10.00%