Real Estate and Accumulated Depreciation (Details) (USD $)	Sep. 30, 2012
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	$ 237,943,911
Land	88,887,014
Buildings and Improvements	424,725,600
Capitalization Subsequent to Acquisition	34,700,089
Shopping Center [Member] | Somerset, NJ [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	55,182
Buildings and Improvements	637,097
Capitalization Subsequent to Acquisition	683,934
Vacant Land [Member] | Shelby County, TN [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	11,065
Buildings and Improvements	0
Capitalization Subsequent to Acquisition	0
Vacant Land [Member] | El Paso, TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	1,136,953
Buildings and Improvements	0
Capitalization Subsequent to Acquisition	0
Corporate Office [Member] | Freehold, NJ [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	0
Buildings and Improvements	21,286
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Monaca, PA [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	330,772
Buildings and Improvements	878,081
Capitalization Subsequent to Acquisition	1,740,778
Industrial Building [Member] | Orangeburg, NY [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	694,720
Buildings and Improvements	2,977,372
Capitalization Subsequent to Acquisition	18,626
Industrial Building [Member] | Greensboro, NC [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	327,100
Buildings and Improvements	1,853,700
Capitalization Subsequent to Acquisition	14,546
Industrial Building [Member] | Ridgeland, MS [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	218,000
Buildings and Improvements	1,233,500
Capitalization Subsequent to Acquisition	399,294
Industrial Building [Member] | Urbandale, IA [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	310,000
Buildings and Improvements	1,758,000
Capitalization Subsequent to Acquisition	93,895
Industrial Building [Member] | Richland, MS [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	211,000
Buildings and Improvements	1,195,000
Capitalization Subsequent to Acquisition	72,000
Industrial Building [Member] | O'Fallon, MO [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	264,000
Buildings and Improvements	3,302,000
Capitalization Subsequent to Acquisition	334,602
Industrial Building [Member] | Fayetteville, NC [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,393,480
Land	172,000
Buildings and Improvements	4,467,885
Capitalization Subsequent to Acquisition	213,229
Industrial Building [Member] | Schaumburg, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	1,039,800
Buildings and Improvements	3,694,320
Capitalization Subsequent to Acquisition	233,519
Industrial Building [Member] | Burr Ridge, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	127,858
Land	270,000
Buildings and Improvements	1,236,599
Capitalization Subsequent to Acquisition	57,163
Industrial Building [Member] | Romulus, MI [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,811,133
Land	531,000
Buildings and Improvements	3,653,883
Capitalization Subsequent to Acquisition	298,730
Industrial Building [Member] | Liberty, MO [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	259,672
Land	735,222
Buildings and Improvements	6,498,324
Capitalization Subsequent to Acquisition	110,952
Industrial Building [Member] | Omaha, NE [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	566,053
Land	1,170,000
Buildings and Improvements	4,425,500
Capitalization Subsequent to Acquisition	93,905
Industrial Building [Member] | Charlottesville, VA [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	506,266
Land	1,170,000
Buildings and Improvements	2,845,000
Capitalization Subsequent to Acquisition	57,518
Industrial Building [Member] | Jacksonville, FL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,551,257
Land	1,165,000
Buildings and Improvements	4,668,080
Capitalization Subsequent to Acquisition	322,420
Industrial Building [Member] | West Chester Twp, OH [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,918,809
Land	695,000
Buildings and Improvements	3,342,000
Capitalization Subsequent to Acquisition	1,024,253
Industrial Building [Member] | Richmond [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,692,150
Land	1,160,000
Buildings and Improvements	6,413,305
Capitalization Subsequent to Acquisition	139,758
Industrial Building [Member] | St. Joseph, MO [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,041,207
Land	800,000
Buildings and Improvements	11,753,964
Capitalization Subsequent to Acquisition	562,906
Industrial Building [Member] | Newington, CT [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	883,732
Land	410,000
Buildings and Improvements	2,961,000
Capitalization Subsequent to Acquisition	19,459
Industrial Building [Member] | Cudahy, WI [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,554,081
Land	980,000
Buildings and Improvements	5,050,997
Capitalization Subsequent to Acquisition	3,342,675
Industrial Building [Member] | Beltsville, MD [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	7,621,060
Land	3,200,000
Buildings and Improvements	5,958,773
Capitalization Subsequent to Acquisition	5,228,011
Industrial Building [Member] | Granite City, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,711,003
Land	340,000
Buildings and Improvements	12,046,675
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Monroe, NC [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,609,176
Land	500,000
Buildings and Improvements	4,981,022
Capitalization Subsequent to Acquisition	8,800
Industrial Building [Member] | Winston-Salem, NC [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	980,000
Buildings and Improvements	5,610,000
Capitalization Subsequent to Acquisition	308,426
Industrial Building [Member] | Elgin, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,139,149
Land	1,280,000
Buildings and Improvements	5,529,488
Capitalization Subsequent to Acquisition	51,007
Industrial Building [Member] | Tolleson, AZ [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	5,233,830
Land	1,320,000
Buildings and Improvements	13,329,000
Capitalization Subsequent to Acquisition	510,496
Industrial Building [Member] | Ft. Myers, FL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,126,128
Land	1,910,000
Buildings and Improvements	2,499,093
Capitalization Subsequent to Acquisition	568,356
Industrial Building [Member] | Edwardsville, KS [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,184,083
Land	1,185,000
Buildings and Improvements	5,815,148
Capitalization Subsequent to Acquisition	25,253
Industrial Building [Member] | Tampa, FL (FDX Gr) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	9,125,605
Land	5,000,000
Buildings and Improvements	12,660,003
Capitalization Subsequent to Acquisition	59,822
Industrial Building [Member] | Denver, CO [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,138,347
Land	1,150,000
Buildings and Improvements	3,890,300
Capitalization Subsequent to Acquisition	1,313,751
Industrial Building [Member] | Hanahan, SC (Norton) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	6,806,437
Land	1,129,000
Buildings and Improvements	11,831,321
Capitalization Subsequent to Acquisition	12,153
Industrial Building [Member] | Hanahan, SC (FDX) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,079,725
Land	930,000
Buildings and Improvements	3,426,362
Capitalization Subsequent to Acquisition	3,250,308
Industrial Building [Member] | Augusta, GA (FDX Gr) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,512,799
Land	614,406
Buildings and Improvements	3,026,409
Capitalization Subsequent to Acquisition	1,688,059
Industrial Building [Member] | Huntsville, AL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,517,136
Land	748,115
Buildings and Improvements	2,724,418
Capitalization Subsequent to Acquisition	1,276,113
Industrial Building [Member] | Richfield, OH [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,323,512
Land	1,000,000
Buildings and Improvements	7,197,945
Capitalization Subsequent to Acquisition	10,788
Industrial Building [Member] | Colorado Springs, CO [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,331,135
Land	1,270,000
Buildings and Improvements	3,821,000
Capitalization Subsequent to Acquisition	2,104,115
Industrial Building [Member] | Tampa, FL (FDX) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,755,184
Land	2,830,000
Buildings and Improvements	4,704,531
Capitalization Subsequent to Acquisition	31,186
Industrial Building [Member] | Griffin, GA [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	8,219,757
Land	760,000
Buildings and Improvements	13,692,115
Capitalization Subsequent to Acquisition	416,742
Industrial Building [Member] | Roanoke, VA [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,617,193
Land	1,853,000
Buildings and Improvements	4,817,298
Capitalization Subsequent to Acquisition	145,399
Industrial Building [Member] | Orion, MI [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	10,453,436
Land	3,630,000
Buildings and Improvements	13,053,289
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Carlstadt, NJ [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,442,483
Land	1,194,000
Buildings and Improvements	3,645,501
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Wheeling, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,792,255
Land	5,112,120
Buildings and Improvements	9,186,606
Capitalization Subsequent to Acquisition	4,238,017
Industrial Building [Member] | White Bear Lake, MN [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	1,393,000
Buildings and Improvements	3,764,126
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Cheektowaga, NY [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,414,778
Land	4,768,000
Buildings and Improvements	3,883,971
Capitalization Subsequent to Acquisition	2,280,086
Industrial Building [Member] | Richmond, VA (Carrier) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	0
Land	446,000
Buildings and Improvements	3,910,500
Capitalization Subsequent to Acquisition	14,415
Industrial Building [Member] | Montgomery, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	5,149,186
Land	2,000,000
Buildings and Improvements	9,225,683
Capitalization Subsequent to Acquisition	72,684
Industrial Building [Member] | Tampa, FL (Vacant) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,547,002
Land	1,867,000
Buildings and Improvements	3,684,794
Capitalization Subsequent to Acquisition	65,080
Industrial Building [Member] | Augusta, GA (FDX) [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,075,398
Land	380,000
Buildings and Improvements	1,400,943
Capitalization Subsequent to Acquisition	145,989
Industrial Building [Member] | Lakeland, FL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,314,513
Land	261,000
Buildings and Improvements	1,621,163
Capitalization Subsequent to Acquisition	51,055
Industrial Building [Member] | El Paso, TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,556,424
Land	2,088,242
Buildings and Improvements	4,514,427
Capitalization Subsequent to Acquisition	16,980
Industrial Building [Member] | Chattanooga, TN [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,370,566
Land	300,000
Buildings and Improvements	4,464,711
Capitalization Subsequent to Acquisition	2,560
Industrial Building [Member] | Bedford Heights, OH [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,334,608
Land	990,000
Buildings and Improvements	4,893,912
Capitalization Subsequent to Acquisition	736,401
Industrial Building [Member] | Kansas City, MO [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,754,812
Land	660,000
Buildings and Improvements	4,049,832
Capitalization Subsequent to Acquisition	38,542
Industrial Building [Member] | Punta Gorda, FL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,430,666
Land	660,000
Buildings and Improvements	3,444,915
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Cocoa, FL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	6,159,845
Land	1,881,317
Buildings and Improvements	8,623,564
Capitalization Subsequent to Acquisition	16,577
Industrial Building [Member] | Orlando, FL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	5,172,705
Land	2,200,000
Buildings and Improvements	6,133,800
Capitalization Subsequent to Acquisition	159,104
Industrial Building [Member] | Topeka, KS [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,192,408
Land	0
Buildings and Improvements	3,679,843
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Memphis, TN [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	9,478,694
Land	1,220,000
Buildings and Improvements	13,380,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Houston, TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,597,844
Land	1,730,000
Buildings and Improvements	6,320,000
Capitalization Subsequent to Acquisition	19,652
Industrial Building [Member] | Carrollton, TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	10,426,352
Land	1,500,000
Buildings and Improvements	16,240,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Ft. Mill, SC [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,881,926
Land	1,670,000
Buildings and Improvements	10,045,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Lebanon, TN [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	8,364,855
Land	2,230,000
Buildings and Improvements	11,985,126
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Rockford, IL [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	1,850,372
Land	1,100,000
Buildings and Improvements	4,440,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Edinburg, TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,569,920
Land	1,000,000
Buildings and Improvements	6,414,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Streetsboro, OH [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	12,387,391
Land	1,760,000
Buildings and Improvements	17,840,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Corpus Christi, TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	3,012,724
Land	0
Buildings and Improvements	4,764,500
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Halfmoon, NY [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	4,158,552
Land	1,190,000
Buildings and Improvements	4,335,600
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Lebanon, OH [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	2,974,113
Land	240,000
Buildings and Improvements	4,176,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Olive Branch, MS [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	10,807,516
Land	800,000
Buildings and Improvements	13,750,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Oklahoma City, OK [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	6,134,146
Land	1,410,000
Buildings and Improvements	8,043,000
Capitalization Subsequent to Acquisition	0
Industrial Building [Member] | Waco,TX [Member]
Summary of real estate and accumulated depreciation amount of encumbrances, land and buildings and improvements and capitalization subsequent to acquisition
Encumbrances	5,781,464
Land	1,350,000
Buildings and Improvements	7,383,000
Capitalization Subsequent to Acquisition	$ 0