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Organization and Stock Offerings (Narrative) (Details)									12 Months Ended
	Dec. 15, 2020 USD ($) shares	Sep. 01, 2020 USD ($) shares	Aug. 31, 2020 USD ($) $ / shares shares	Aug. 10, 2020 USD ($) $ / shares shares	Jul. 13, 2020 USD ($) shares	Dec. 30, 2019 USD ($) $ / shares shares	Feb. 25, 2019 USD ($) $ / shares shares	Jan. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) item $ / shares	Dec. 31, 2019 USD ($) $ / shares
Organization And Stock Offerings Disclosure [Line Items]
Number of locations | item									29
Preferred stock redeemed, value | $									$ 10,485,000
Common stock, no par value | $ / shares									$ 0	$ 0
Proceeds from issuance of common stock | $									$ 357,000	$ 19,113,000
Series H Preferred Stock [Member]
Organization And Stock Offerings Disclosure [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 | shares	225	590			308
Preferred stock, liquidation preference per share | $ / shares									$ 10,000
Series F Preferred Stock [Member]
Organization And Stock Offerings Disclosure [Line Items]
Preferred stock, dividend rate			6.00%						6.00%	6.00%
Preferred stock redeemed, shares | shares			6,465
Preferred stock, redemption price | $ / shares			$ 1,000
Preferred stock redeemed, value | $			$ 6,500,000
Preferred stock, liquidation preference per share | $ / shares										$ 1,000
Series C Preferred Stock [Member]
Organization And Stock Offerings Disclosure [Line Items]
Preferred stock, dividend rate				6.00%					6.00%	6.00%
Preferred stock redeemed, shares | shares				388
Preferred stock, redemption price | $ / shares				$ 10,000
Preferred stock redeemed, value | $				$ 3,900,000
Preferred stock, liquidation preference per share | $ / shares										$ 10,000
Common Stock [Member]
Organization And Stock Offerings Disclosure [Line Items]
Proceeds from issuance of private placement | $							$ 6,272,000
Shares issued | shares						1,020,408	496,224
Common stock, no par value | $ / shares						$ 0
Shares issued, price per share | $ / shares						$ 12.25	$ 12.64
Proceeds from issuance of common stock | $						$ 12,500,000
Series G Preferred Stock [Member]
Organization And Stock Offerings Disclosure [Line Items]
Preferred stock, dividend rate								6.00%	6.00%	6.00%
Proceeds from issuance of private placement | $								$ 5,330,000
Shares issued | shares								533
Proceeds from issuance of common stock | $								$ 5,300,000
Preferred stock, liquidation preference per share | $ / shares								$ 10,000	$ 10,000	$ 10,000
Directors And Officers [Member] | Common Stock [Member]
Organization And Stock Offerings Disclosure [Line Items]
Shares issued | shares							286,244

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