Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details) - USD ($)	3 Months Ended																12 Months Ended
	Dec. 31, 2020		Sep. 30, 2020		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss) income	$ 6,183,000		$ 1,404,000		$ (6,009,000)		$ (2,098,000)		$ (9,914,000)		$ 2,947,000		$ 5,544,000		$ 2,989,000		$ (520,000)	$ 1,566,000	$ 4,358,000
Preferred stock dividends																	(10,752,000)	(10,752,000)	(10,863,000)
Preferred stock redemption costs																			(3,507,000)
Net (income) attributable to noncontrolling interests																	(552,000)	(490,000)	(469,000)
Net earnings allocated to unvested shares																	(238,000)	(558,000)	(628,000)
Net (loss) attributable to vested common shares																	$ (12,062,000)	$ (10,234,000)	$ (11,109,000)
Weighted average number of vested common shares outstanding, basic and diluted																	13,104,000	13,082,000	13,397,000
Net (loss) per common share attributable to common shareholders, basic and diluted	$ 0.25	[1]	$ (0.11)	[1]	$ (0.67)	[1]	$ (0.39)	[1]	$ (0.98)	[1]	$ 0.00	[1]	$ 0.20	[1]	$ 0.00	[1]	$ (0.92)	$ (0.78)	$ (0.83)

[1] Differences between the sum of the four quarterly per share amounts and the annual per share amounts, if any, are attributable to the effect of the weighted average outstanding share calculation for the respective periods.