Shareholders' Equity (Details Narrative)				1 Months Ended	12 Months Ended
	Sep. 29, 2008	Oct. 01, 2003 USD ($) CommercialProperties $ / shares shares	Jun. 30, 2003 USD ($) shares	Jul. 31, 2006	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2004 shares	Mar. 31, 2016 $ / shares shares	Sep. 29, 2006 USD ($) $ / shares shares
Class of Stock [Line Items]
Shares authorized (in shares)					450,000,000			110,000,000
Common stock, authorized (in shares)					400,000,000	400,000,000		100,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.01	$ 0.01		$ 0.01
Preferred stock, authorized (in shares)					50,000,000			10,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.01	$ 0.01
Value of preferred and common shares outstanding | $					$ 590,000
Reverse stock split conversion ratio				75
Preferred shares, issued, shares converted into restricted common shares					0
Share-based Compensation | $					$ 0
Service period and vesting period restriction date	2 years
Sale of general partnership, percentage interest sold		92.90%
Number of commercial properties | CommercialProperties		4
Treasury stock, shares received from sale of interest in general partnership		38,130
Average closing price of treasury stock shares received over a thirty day period | $ / shares		$ 21.00
Value of common stock received into treasury as partial proceeds in sale of general partnership | $		$ 801,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted					163,116
Grant date fair value of restricted shares which would be recognized upon meeting performance goals | $					$ 1,847,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number					5,333
Restricted common shares, balance, grant date fair value | $					$ 79,000
Maximum value of restricted common shares issuable to each trustee for achievement of certain performance criteria | $					$ 26,000,000
Denominator, the period over which the average closing price of common stock is averaged					30 days
Period over which the pro-forma acquisition income target must be meet					5 years
The percentage increase in net operating income and funds from operations which must be meet					5.00%
Shares granted (in shares)					0	0
Aggregate intrinsic value for options | $					$ 0
Unrecognized cost related to stock options | $					0	$ 0
Individual Trustee [Member]
Class of Stock [Line Items]
Shares granted (in shares)							667
Restricted Stock [Member]
Class of Stock [Line Items]
Award vesting rights, minimum gross assets | $					$ 50,000,000
Restricted Stock [Member] | March 4, 2004 [Member]
Class of Stock [Line Items]
Award vesting rights, percentage					50.00%
Restricted Stock [Member] | March 4, 2005 [Member]
Class of Stock [Line Items]
Award vesting rights, percentage					25.00%
Restricted Stock [Member] | March 4, 2006 [Member]
Class of Stock [Line Items]
Award vesting rights, percentage					25.00%
1998 Share Option Plan [Member] | Minimum [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant							42,222
1998 Share Option Plan [Member] | Maximum [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant							46,666
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, authorized (in shares)					1,518,000			1,518,000
Preferred stock, outstanding (in shares)					95,226
Preferred stock, liquidation preference (in dollars per share) | $ / shares					$ 10.00
Conversion ratio, preferred shares to common shares					0.046
Preferred shares, issued, shares converted into restricted common shares			534,668		0	1,600
Restricted common shares that restricted class A cumulative convertible preferred shares were converted into shares			163,116		73
Preferred shares, issued, remaining shares			161,410
Preferred shares, number of restricted common shares each preferred share can be converted into shares			0.305
Series A Preferred Stock [Member] | Restricted Stock [Member]
Class of Stock [Line Items]
Preferred stock, issued (in shares)			696,078
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued | $			$ 2,400,000
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, authorized (in shares)					300,000			300,000	300,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares					$ 10.00				$ 10.00
Preferred shares, denominator value conversion price to calculate the conversion rate to exchange preferred class C shares for common shares | $									$ 1.00
Preferred shares to be purchased under subscription agreement									44,444
Restricted stock agreement, number of convertible preferred shares certain trustees entitled to receive in lieu of cash for services, shares									12,500
Series C Preferred Stock [Member] | Three Independent Trustees [Member]
Class of Stock [Line Items]
Preferred shares to be purchased under subscription agreement									125,000
Preferred shares to be purchased under subscription agreement, aggregate contribution | $									$ 500,000
OP Units [Member]
Class of Stock [Line Items]
OP units outstanding (in shares)					16,688,167	16,688,167