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Stockholders' Equity (Narrative) (Details) - USD ($)					3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 13, 2020	Dec. 30, 2019	Feb. 25, 2019	Jan. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Stockholders' Equity Note [Line Items]
Proceeds from issuance of common stock							$ 93,000	$ 6,391,000
Series H Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate							3.50%
Series H Preferred Stock [Member] | Subsequent Event [Member]
Stockholders' Equity Note [Line Items]
Shares issued	308
Proceeds from issuance of private placement	$ 3,080,000
Preferred stock, dividend rate	3.50%
Common Stock [Member]
Stockholders' Equity Note [Line Items]
Shares issued		1,020,408	496,224
Proceeds from issuance of common stock		$ 12,500,000
Proceeds from issuance of private placement			$ 6,272,000
Series G Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Shares issued				533
Proceeds from issuance of private placement				$ 5,330,000
Preferred stock, dividend rate				6.00%	6.00%	6.00%	6.00%	6.00%	6.00%
Series F Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate					6.00%	6.00%	6.00%	6.00%	6.00%
Directors And Officers [Member] | Common Stock [Member]
Stockholders' Equity Note [Line Items]
Shares issued			286,244

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