Schedule III Real Estate - Held for Sale (Assets Held-for-sale [Member], USD $)	12 Months Ended
	Dec. 31, 2011 year
Real Estate Held for Sale the Company has Invested in [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Land	25,818,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,471,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	762,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	20,797,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,912,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	37,709,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	527,000
Power Center-Midland, MI [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,085,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,635,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	27,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,085,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,662,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,747,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Elmira, NY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,248,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,159,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	735,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,248,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,026,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,274,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Topsham, ME [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,885,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,735,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,885,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	62,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,947,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	951,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,090,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	951,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,063,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,014,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Waxahachie, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,249,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,097,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,249,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,069,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,318,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Harlingen, TX-1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	247,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	807,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	247,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	807,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,054,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Harlingen, TX-2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	749,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,238,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	749,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,238,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,987,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Power Center-Woodstock, GA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	261,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	701,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	261,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	606,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	867,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Roese Contracting-Hillman, MI [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	167,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	823,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	167,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	363,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	530,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	64,000
Real Estate and Accumulated Depreciation, Life Used for Depreciation	40
Tutor Time-Elk Grove, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,216,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,786,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,216,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,741,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	3,957,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	0
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Grand Prairie, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	387,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	108,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	108,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Florence, AL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,034,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	748,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	748,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Topsham, ME [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,034,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	293,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	293,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Rockwall, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,036,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,036,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Longwood, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	975,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	975,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	975,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Fairfield Township, OH [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,350,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,868,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,868,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Bonita Springs, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	112,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	25,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	25,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Lancaster, OH [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,135,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,342,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,342,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Land-Hadley, MA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,869,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,619,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,619,000	[1],[2]
Real Estate and Accumulated Depreciation, Life Used for Depreciation	0
Vacant Property-Jacksonville, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	987,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	856,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	794,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	0	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	794,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	170,000
Real Estate and Accumulated Depreciation, Life Used for Depreciation	40
Vacant Property-Woodstock, GA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,937,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,285,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,891,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,016,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,907,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	210,000
Real Estate and Accumulated Depreciation, Life Used for Depreciation	40
Vacant Property-Olean, NY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	0
Real Estate and Accumulated Depreciation, Initial Cost of Land	40,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	259,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	40,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	259,000	[1],[2]
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	299,000	[1],[2]
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 83,000
Real Estate and Accumulated Depreciation, Life Used for Depreciation	20

[1] Principal and interest is payable at level amounts over the life of the loan.

[2] The following shows the changes in the carrying amounts of mortgage loans during the years: 2011 2010 2009 Balance at beginning of year$21,138 $34,707 $35,993 New mortgage loans8,098 (h) 6,302 (h) 2,259 (h) Deductions during the year: Collections of principal(6,421) (7,148) (3,545) Foreclosures— (12,723) — Balance at the close of year$22,815 $21,138 $34,707