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Related Party Transactions - Other (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Chairman | General and administrative expense
Related Party Transactions
Fees under compensation and services agreement	$ 74,500	$ 72,400
Vice Chairman
Related Party Transactions
Fees under compensation and services agreement	29,800	28,900
Gould Investors L.P. | Real estate expenses
Related Party Transactions
Insurance expense recognized of amounts reimbursed to related party	$ 245,000	$ 222,000	$ 490,000	$ 447,000

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