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Stockholders' Equity (Narrative) (Details) - USD ($)									12 Months Ended
	Dec. 15, 2020	Sep. 01, 2020	Aug. 31, 2020	Aug. 10, 2020	Jul. 13, 2020	Dec. 30, 2019	Feb. 25, 2019	Jan. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Stockholders' Equity Note [Line Items]
Preferred stock redeemed, value									$ 10,485,000
Proceeds from issuance of common stock									$ 357,000	$ 19,113,000
Series H Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate	3.50%	3.50%			3.50%				3.50%
Proceeds from issuance of private placement	$ 2,250,000	$ 5,900,000			$ 3,100,000
Shares issued	225	590			308
Series F Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate			6.00%						6.00%	6.00%
Preferred stock redeemed, shares			6,465
Preferred stock, redemption price			$ 1,000
Preferred stock redeemed, value			$ 6,500,000
Series C Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate				6.00%					6.00%	6.00%
Preferred stock redeemed, shares				388
Preferred stock, redemption price				$ 10,000
Preferred stock redeemed, value				$ 3,900,000
Common Stock [Member]
Stockholders' Equity Note [Line Items]
Proceeds from issuance of private placement							$ 6,272,000
Shares issued						1,020,408	496,224
Proceeds from issuance of common stock						$ 12,500,000
Series G Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate								6.00%	6.00%	6.00%
Proceeds from issuance of private placement								$ 5,330,000
Shares issued								533
Proceeds from issuance of common stock								$ 5,300,000
Directors And Officers [Member] | Common Stock [Member]
Stockholders' Equity Note [Line Items]
Shares issued							286,244

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