Real Estate and Accumulated Depreciation - Real Estate and Accumulated Depreciation (Details) (USD $)	Dec. 31, 2012
Acquisition Date
Azusa, CA Date	1986-01
Elgin, IL Date	1986-03
Everett, WA Date	1985-06
Monterey Park, CA Date	1985-12
Romeoville, IL Date	1986-05
Aurora, CO Date	1985-09
Land
Azusa, CA	696,000
Elgin, IL	376,000
Everett, WA	352,350
Monterey Park, CA	420,200
Romeoville, IL	298,740
Aurora, CO	586,500
Total	2,729,790
Building and Improvements
Azusa, CA	2,095,965
Elgin, IL	1,424,577
Everett, WA	1,252,536
Monterey Park, CA	1,409,050
Romeoville, IL	2,180,802
Aurora, CO	2,521,560
Total	10,884,490
Costs Subsequent To Acquition
Azusa, CA	19,563
Elgin, IL	18,445
Everett, WA	27,565
Monterey Park, CA	118,350
Romeoville, IL	89,631
Aurora, CO	135,030
Total	408,584
Real Estate and Accumulated Depreciation, Carrying Amount of Land
Azusa, CA	696,000
Elgin, IL	376,000
Everett, WA	352,350
Monterey Park, CA	420,200
Romeoville, IL	298,740
Aurora, CO	586,500
Total	2,729,790
Buildings and Improvements
Azusa, CA	2,115,528
Elgin, IL	1,443,022
Everett, WA	1,280,101
Monterey Park, CA	1,527,400
Romeoville, IL	2,270,433
Aurora, CO	2,656,590
Total	11,293,074
Total
Azusa, CA	2,811,528
Elgin, IL	1,819,022
Everett, WA	1,632,451
Monterey Park, CA	1,947,600
Romeoville, IL	2,569,173
Aurora, CO	3,243,090
Total	14,022,864
Accumulated Depreciation
Azusa, CA	(2,115,528)
Elgin, IL	(1,443,021)
Everett, WA	(1,278,657)
Monterey Park, CA	(1,441,094)
Romeoville, IL	(2,256,371)
Aurora, CO	(2,647,588)
Total	(11,182,259)