Shareholders' Equity (Details Narrative)							12 Months Ended
	Sep. 29, 2006 USD ($) $ / shares shares	Mar. 04, 2006	Mar. 04, 2005	Mar. 04, 2004	Oct. 01, 2003 USD ($) CommercialProperties $ / shares shares	Jun. 30, 2003 USD ($) shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2004 shares
Class of Stock [Line Items]
Preferred shares, issued, shares converted into restricted common shares							0
Share based compensation | $							$ 0
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
Restricted common shares granted							163,116
Grant date fair value of restricted shares which would be recognized upon meeting performance goals | $							$ 1,847,000
Restricted common shares, balance							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%
Options granted during the period
Remaining unrecognized cost | $							$ 0	$ 0
1998 Share Option Plan [Member] | Minimum [Member]
Class of Stock [Line Items]
Number of shares available for grant under the 1998 share option plan and its subsequent amendment									42,222
1998 Share Option Plan [Member] | Maximum [Member]
Class of Stock [Line Items]
Number of shares available for grant under the 1998 share option plan and its subsequent amendment									46,666
2004 Plan [Member]
Class of Stock [Line Items]
Option, expiration year								2014
Maximum exercise term of options granted under the 2004 plan								10 years
Class A Preferred Shares [Member]
Class of Stock [Line Items]
Preferred stock, class A cumulative preferred shares, issued to the public							96,826
Preferred stock, liquidation preference | $ / shares							$ 10.00
Preferred shares, outstanding, conversion rate for shares exchange to common stock subject to certain formulas | $ / shares							$ 0.046
Preferred shares, issued						696,078
Preferred shares, issued, value | $						$ 2,400,000
Preferred shares, issued, vesting date trigger, gross assets exceed this value | $						$ 50,000,000
Preferred shares, issued, shares converted into restricted common shares						534,668
Restricted common shares that restricted class A cumulative convertible preferred shares were converted into shares						163,116
Preferred shares, issued, remaining shares						161,410
Preferred shares, number of restricted common shares each preferred share can be converted into shares						Each be converted into 0.305 restricted common shares.
Class A Preferred Shares [Member] | Restricted Shares [Member]
Class of Stock [Line Items]
Preferred shares, issued, vesting date trigger, percentage vesting		25.00%	25.00%	50.00%
Class C Preferred Shares [Member]
Class of Stock [Line Items]
Preferred stock, liquidation preference | $ / shares	$ 10.00
Preferred shares, authorized by articles filed supplementary to declaration of trust	300,000
Preferred shares, denominator value conversion price to calculate the conversion rate to exchange preferred class C shares for common shares | $	$ 1
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
Share based compensation | $	$ 0
Service period and vesting period restriction date	Sep. 30, 2016
Class C Preferred Shares [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