Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary of Significant Accounting Policies
Net income	$ 2,206,000	$ (109,000)	$ 6,127	$ 2,841
Non-controlling interest (income) loss	0	78	105	106
Preferred stock dividends	65,000	79,000	197,000	236,000
Net income (loss) available to common stockholders	$ 2,141	$ (266)	$ 5,825	$ 2,499