Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Cost:
Depreciation, Balance at End of Year	$ 14,374,079
Encumbrances				$ 60,400,000
Land				94,765,974
Building & Improvements				169,101,805
Improvements				5,103,096
Land				94,765,974
Buildings				174,204,901
Total	268,970,875			268,970,875
Balance at End of Year	268,970,875
American Signature Furniture, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	148,326
Land				2,226,066
Building & Improvements				2,069,927
Land				2,226,066
Buildings				2,069,927
Total	4,295,993			4,295,993
Balance at End of Year	$ 4,295,993
Accumulated Depreciation:
Acquired	Jul. 17, 2014
Life	35 years
Bank of America, Garden Grove, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 112,120
Encumbrances				1,840,985
Land				1,745,447
Building & Improvements				1,454,531
Land				1,745,447
Buildings				1,454,531
Total	3,199,978			3,199,978
Balance at End of Year	$ 3,199,978
Accumulated Depreciation:
Acquired	Dec. 13, 2012
Life	40 years
Bank of America, La Habra, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 118,212
Encumbrances				1,236,866
Land				571,573
Building & Improvements				1,578,333
Land				571,573
Buildings				1,578,333
Total	2,149,906			2,149,906
Balance at End of Year	$ 2,149,906
Accumulated Depreciation:
Acquired	Dec. 13, 2012
Life	40 years
Bank of America, Laguna, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 127,185
Encumbrances				1,657,646
Land				1,231,328
Building & Improvements				1,649,972
Land				1,231,328
Buildings				1,649,972
Total	2,881,300			2,881,300
Balance at End of Year	$ 2,881,300
Accumulated Depreciation:
Acquired	Dec. 13, 2012
Life	40 years
Bank of America, Los Alamitos, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 62,401
Encumbrances				922,796
Land				771,976
Building & Improvements				832,016
Land				771,976
Buildings				832,016
Total	1,603,992			1,603,992
Balance at End of Year	$ 1,603,992
Accumulated Depreciation:
Acquired	Dec. 13, 2012
Life	40 years
Bank of America, Puerta Real Mission Viejo, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 58,112
Encumbrances				734,920
Land				523,539
Building & Improvements				753,890
Land				523,539
Buildings				753,890
Total	1,277,429			1,277,429
Balance at End of Year	$ 1,277,429
Accumulated Depreciation:
Acquired	Dec. 13, 2012
Life	40 years
Bank of America, Trabuco Mission Viejo, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 107,489
Encumbrances				1,115,623
Land				544,713
Building & Improvements				1,394,450
Land				544,713
Buildings				1,394,450
Total	1,939,163			1,939,163
Balance at End of Year	$ 1,939,163
Accumulated Depreciation:
Acquired	Jan. 03, 2013
Life	40 years
Bank of America, Walnut, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 91,058
Encumbrances				1,298,571
Land				1,043,050
Building & Improvements				1,214,110
Land				1,043,050
Buildings				1,214,110
Total	2,257,160			2,257,160
Balance at End of Year	$ 2,257,160
Accumulated Depreciation:
Acquired	Jan. 03, 2013
Life	40 years
Bank of America, Westminster, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 83,364
Encumbrances				1,744,565
Land				1,950,902
Building & Improvements				1,081,480
Land				1,950,902
Buildings				1,081,480
Total	3,032,382			3,032,382
Balance at End of Year	$ 3,032,382
Accumulated Depreciation:
Acquired	Jan. 03, 2013
Life	40 years
Bank of America, Yorba Linda, CA [Member]
Cost:
Depreciation, Balance at End of Year	$ 37,523
Encumbrances				1,003,175
Land				1,245,514
Building & Improvements				498,193
Land				1,245,514
Buildings				498,193
Total	1,743,707			1,743,707
Balance at End of Year	$ 1,743,707
Accumulated Depreciation:
Acquired	Jan. 03, 2013
Life	40 years
Barnes & Noble, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 1,426,125
Land				1,798,600
Building & Improvements				3,803,000
Land				1,798,600
Buildings				3,803,000
Total	5,601,600			5,601,600
Balance at End of Year	$ 5,601,600
Accumulated Depreciation:
Acquired	Dec. 15, 2005
Life	40 years
Best Buy, McDonough, GA [Member]
Cost:
Depreciation, Balance at End of Year	$ 754,688
Land				2,622,682
Building & Improvements				3,150,000
Land				2,622,682
Buildings				3,150,000
Total	5,772,682			5,772,682
Balance at End of Year	$ 5,772,682
Accumulated Depreciation:
Acquired	Jun. 15, 2006
Life	40 years
Big Lots, Germantown, MD [Member]
Cost:
Depreciation, Balance at End of Year	$ 172,155
Encumbrances				3,300,000
Land				1,781,918
Building & Improvements				2,951,231
Land				1,781,918
Buildings				2,951,231
Total	4,733,149			4,733,149
Balance at End of Year	$ 4,733,149
Accumulated Depreciation:
Acquired	Sep. 13, 2013
Life	40 years
Big Lots, Phoenix, AZ [Member]
Cost:
Depreciation, Balance at End of Year	$ 222,408
Encumbrances				3,400,000
Land				1,715,717
Building & Improvements				3,050,164
Land				1,715,717
Buildings				3,050,164
Total	4,765,881			4,765,881
Balance at End of Year	$ 4,765,881
Accumulated Depreciation:
Acquired	Jan. 23, 2013
Life	40 years
Buffalo Wild Wings, Phoenix, AZ [Member]
Cost:
Encumbrances				987,715
Land				1,716,834
Land				1,716,834
Total	$ 1,716,834			1,716,834
Balance at End of Year	$ 1,716,834
Accumulated Depreciation:
Acquired	Sep. 30, 2012
Container Store, Glendale, AZ [Member]
Cost:
Depreciation, Balance at End of Year	$ 75,655
Land				1,968,398
Building & Improvements				5,493,102
Land				1,968,398
Buildings				5,493,102
Total	7,461,500			7,461,500
Balance at End of Year	$ 7,461,500
Accumulated Depreciation:
Acquired	May 18, 2015
Life	55 years
CVS, Sebring, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 556,243
Land				1,312,472
Building & Improvements				1,722,559
Land				1,312,472
Buildings				1,722,559
Total	3,035,031			3,035,031
Balance at End of Year	$ 3,035,031
Accumulated Depreciation:
Acquired	Feb. 04, 2003
Life	40 years
CVS, Tallahassee, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 677,661
Encumbrances				2,112,360
Land				590,800
Building & Improvements				1,595,000
Improvements				1,485,878
Land				590,800
Buildings				3,080,878
Total	3,671,678			3,671,678
Balance at End of Year	$ 3,671,678
Accumulated Depreciation:
Acquired	Dec. 13, 2000
Life	40 years
Dick's Sporting Goods, McDonough, GA [Member]
Cost:
Depreciation, Balance at End of Year	$ 1,132,031
Land				3,934,022
Building & Improvements				4,725,000
Land				3,934,022
Buildings				4,725,000
Total	8,659,022			8,659,022
Balance at End of Year	$ 8,659,022
Accumulated Depreciation:
Acquired	Jun. 15, 2006
Life	40 years
Harris Teeter Supermarket, Charlotte, NC [Member]
Cost:
Depreciation, Balance at End of Year	$ 660,559
Encumbrances				6,600,000
Land				5,601,837
Building & Improvements				3,409,338
Land				5,601,837
Buildings				3,409,338
Total	9,011,175			9,011,175
Balance at End of Year	$ 9,011,175
Accumulated Depreciation:
Acquired	Apr. 17, 2008
Life	40 years
Hilton Resorts Corporation (Office), Orlando, FL One [Member]
Cost:
Depreciation, Balance at End of Year	$ 467,716
Encumbrances				5,171,434
Land				2,810,942
Building & Improvements				6,590,681
Land				2,810,942
Buildings				6,590,681
Total	9,401,623			9,401,623
Balance at End of Year	$ 9,401,623
Accumulated Depreciation:
Acquired	Jan. 30, 2013
Life	40 years
Hilton Resorts Corporation (Office), Orlando, FL Two [Member]
Cost:
Depreciation, Balance at End of Year	$ 192,512
Encumbrances				2,128,566
Land				1,210,138
Building & Improvements				2,453,690
Improvements				205,887
Land				1,210,138
Buildings				2,659,577
Total	3,869,715			3,869,715
Balance at End of Year	$ 3,869,715
Accumulated Depreciation:
Acquired	Jan. 30, 2013
Life	40 years
JP Morgan Chase Bank, Chicago, IL [Member]
Cost:
Encumbrances				2,029,983
Land				3,528,492
Land				3,528,492
Total	$ 3,528,492			3,528,492
Balance at End of Year	$ 3,528,492
Accumulated Depreciation:
Acquired	Nov. 30, 2012
Lowe's, Katy, TX [Member]
Cost:
Depreciation, Balance at End of Year	$ 225,649
Encumbrances				8,500,000
Land				9,412,181
Building & Improvements				3,480,650
Land				9,412,181
Buildings				3,480,650
Total	12,892,831			12,892,831
Balance at End of Year	$ 12,892,831
Accumulated Depreciation:
Acquired	Apr. 22, 2014
Life	40 years
Lowe's, Lexington, NC [Member]
Cost:
Depreciation, Balance at End of Year	$ 1,241,465
Land				5,048,640
Building & Improvements				4,548,880
Land				5,048,640
Buildings				4,548,880
Total	9,597,520			9,597,520
Balance at End of Year	$ 9,597,520
Accumulated Depreciation:
Acquired	Jan. 20, 2005
Life	40 years
PNC Bank, Altamonte Springs, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 109,590
Land				3,435,502
Building & Improvements				410,961
Land				3,435,502
Buildings				410,961
Total	3,846,463			3,846,463
Balance at End of Year	$ 3,846,463
Accumulated Depreciation:
Acquired	May 25, 2005
Life	40 years
Rite Aid, Renton, WA [Member]
Cost:
Depreciation, Balance at End of Year	$ 250,633
Encumbrances				4,700,000
Land				2,036,235
Building & Improvements				4,148,415
Land				2,036,235
Buildings				4,148,415
Total	6,184,650			6,184,650
Balance at End of Year	$ 6,184,650
Accumulated Depreciation:
Acquired	Jul. 25, 2013
Life	40 years
Riverside, Jacksonville, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 277,068
Land				6,019,815
Building & Improvements				14,239,515
Improvements				112,277
Land				6,019,815
Buildings				14,351,792
Total	20,371,607			20,371,607
Balance at End of Year	$ 20,371,607
Accumulated Depreciation:
Acquired	Jul. 16, 2015
Life	43 years
The Grove at Winter Park, Winter Park, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 47,124
Land				1,240,000
Building & Improvements				1,860,000
Improvements				23,246
Land				1,240,000
Buildings				1,883,246
Total	3,123,246			3,123,246
Balance at End of Year	$ 3,123,246
Accumulated Depreciation:
Acquired	Mar. 31, 2004
Life	40 years
Walgreens, Alpharetta, GA [Member]
Cost:
Depreciation, Balance at End of Year	$ 413,060
Land				3,265,623
Building & Improvements				1,406,160
Land				3,265,623
Buildings				1,406,160
Total	4,671,783			4,671,783
Balance at End of Year	$ 4,671,783
Accumulated Depreciation:
Acquired	Apr. 11, 2012
Life	40 years
Walgreens, Boulder, CO [Member]
Cost:
Depreciation, Balance at End of Year	$ 320,174
Encumbrances				3,963,967
Land				3,474,934
Building & Improvements				3,415,186
Land				3,474,934
Buildings				3,415,186
Total	6,890,120			6,890,120
Balance at End of Year	$ 6,890,120
Accumulated Depreciation:
Acquired	May 27, 2004
Life	40 years
Walgreens, Clermont, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 367,611
Encumbrances				3,500,000
Land				3,021,665
Building & Improvements				1,269,449
Land				3,021,665
Buildings				1,269,449
Total	4,291,114			4,291,114
Balance at End of Year	$ 4,291,114
Accumulated Depreciation:
Acquired	Feb. 12, 2003
Life	40 years
Walgreens, Palm Bay, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 1,151,121
Encumbrances				2,450,828
Land				1,102,640
Building & Improvements				3,157,360
Land				1,102,640
Buildings				3,157,360
Total	4,260,000			4,260,000
Balance at End of Year	$ 4,260,000
Accumulated Depreciation:
Acquired	Nov. 18, 2015
Life	40 years
Wells Fargo, Raleigh, NC [Member]
Cost:
Depreciation, Balance at End of Year	$ 149,844
Land				8,680,056
Building & Improvements				59,166,753
Land				8,680,056
Buildings				59,166,753
Total	67,846,809			67,846,809
Balance at End of Year	$ 67,846,809
Accumulated Depreciation:
Acquired	Oct. 07, 2014
Life	45 years
Whole Foods Market Centre, Sarasota, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 398,269
Land				4,497,825
Building & Improvements				13,103,480
Improvements				79,242
Land				4,497,825
Buildings				13,182,722
Total	17,680,547			17,680,547
Balance at End of Year	$ 17,680,547
Accumulated Depreciation:
Acquired	Dec. 30, 2014
Life	40 years
Mason Commerce Center-Bldg. 1, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 667,399
Land				66,304
Building & Improvements				1,277,027
Improvements				1,057,677
Land				66,304
Buildings				2,334,704
Total	2,401,008			2,401,008
Balance at End of Year	$ 2,401,008
Accumulated Depreciation:
Construction	Sep. 01, 2008
Life	40 years
Mason Commerce Center-Bldg. 2, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 641,407
Land				66,304
Building & Improvements				1,277,027
Improvements				913,032
Land				66,304
Buildings				2,190,059
Total	2,256,363			2,256,363
Balance at End of Year	$ 2,256,363
Accumulated Depreciation:
Construction	Sep. 01, 2008
Life	40 years
Williamson Business Park-Bldg 3, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 63,613
Land				110,509
Building & Improvements				1,008,784
Improvements				194,458
Land				110,509
Buildings				1,203,242
Total	1,313,751			1,313,751
Balance at End of Year	$ 1,313,751
Accumulated Depreciation:
Construction	May 01, 2014
Life	40 years
Williamson Business Park-Bldg 4, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 78,045
Land				110,509
Building & Improvements				999,320
Improvements				873,902
Land				110,509
Buildings				1,873,222
Total	1,983,731			1,983,731
Balance at End of Year	$ 1,983,731
Accumulated Depreciation:
Construction	May 01, 2014
Life	40 years
Concierge Office Building, Daytona Beach, FL [Member]
Cost:
Depreciation, Balance at End of Year	$ 688,464
Land				293,872
Building & Improvements				2,862,171
Improvements				157,497
Land				293,872
Buildings				3,019,668
Total	3,313,540			3,313,540
Balance at End of Year	$ 3,313,540
Accumulated Depreciation:
Construction	Jul. 01, 2009
Life	40 years
Vacant Pad Site, Winter Park, FL [Member]
Cost:
Land				436,400
Land				436,400
Total	$ 436,400			436,400
Balance at End of Year	$ 436,400
Accumulated Depreciation:
Acquired	May 28, 2015
Real Estate [Member]
Cost:
Depreciation, Balance at Beginning of Year	$ 14,073,096	$ 11,986,949	$ 11,135,501
Depreciation and Amortization	3,224,227	2,441,593	2,066,386
Depreciation on Real Estate Sold	(2,472,192)	(355,446)	(1,214,938)
Depreciation, Balance at End of Year	14,374,079	14,073,096	11,986,949
Total	209,294,277	209,294,277	170,194,285	$ 268,970,875
Reclassification to Land and Development Costs	(451,052)
Balance at Beginning of Year	209,294,277	170,194,285	151,226,811
Additions and Improvements	97,767,725	42,908,366	36,607,950
Adjust to Fair Value	(2,343,013)
Cost of Real Estate Sold	(20,431,548)	(3,808,374)	(17,640,476)
Reclassification to Land and Development Costs	(15,316,566)
Balance at End of Year	$ 268,970,875	$ 209,294,277	$ 170,194,285