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Stockholders' Equity (Narrative) (Details) - USD ($)				3 Months Ended		12 Months Ended
	Dec. 30, 2019	Feb. 25, 2019	Jan. 30, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Stockholders' Equity Note [Line Items]
Proceeds from issuance of common stock				$ (24,000)	$ 6,308,000
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%
Series F Preferred Stock [Member]
Stockholders' Equity Note [Line Items]
Preferred stock, dividend rate				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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