Commitments and Contingencies Current Minimum Annual Payments under Leases (Details) - USD ($)		Jun. 30, 2021	Dec. 31, 2017
Operating Leased Assets [Line Items]
2018			$ 3,274,000
2019			3,347,000
2020			3,422,000
2021	[1]		3,460,000
2022			2,613,000
Thereafter			22,210,000
Total			$ 38,326,000
Scenario, Forecast | The Land Mark at One Market
Operating Leased Assets [Line Items]
Stated monthly lease rate		$ 217,744

[1] Lease payments on The Landmark at One Market lease will be equal to fair rental value from July 2021 through the end of the options lease term. In the table, we have shown the option lease payments for this period based on the stated rate for the month of June 2021 of $217,744.