Schedule III-Real Estate Assets and Accumulated Depreciation and Amortization - Schedule of Properties (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Encumbrances	$ 195,739,481
Land	86,775,988
Buildings & Improvements	327,480,193
Total	414,256,181
Costs Capitalized Subsequent to Acquisition	9,691,307
Land	86,775,988
Buildings & Improvements	337,171,500
Total	423,947,488	$ 235,212,009	$ 138,810,355
Accumulated Depreciation and Amortization	(20,411,794)
Net	403,535,694
Accredo Health
Real Estate [Line Items]
Encumbrances	4,738,338
Land	1,706,641
Buildings & Improvements	9,003,859
Total	10,710,500
Costs Capitalized Subsequent to Acquisition	198,986
Land	1,706,641
Buildings & Improvements	9,202,845
Total	10,909,486
Accumulated Depreciation and Amortization	(1,754,846)
Net	9,154,640
Walgreens
Real Estate [Line Items]
Encumbrances	2,115,104
Land	1,033,105
Buildings & Improvements	3,820,266
Total	4,853,371
Costs Capitalized Subsequent to Acquisition	0
Land	1,033,105
Buildings & Improvements	3,820,266
Total	4,853,371
Accumulated Depreciation and Amortization	(1,175,073)
Net	3,678,298
Dollar General
Real Estate [Line Items]
Encumbrances	634,809
Land	293,912
Buildings & Improvements	1,104,202
Total	1,398,114
Costs Capitalized Subsequent to Acquisition	0
Land	293,912
Buildings & Improvements	1,104,202
Total	1,398,114
Accumulated Depreciation and Amortization	(125,762)
Net	1,272,352
Dollar General
Real Estate [Line Items]
Encumbrances	640,014
Land	212,036
Buildings & Improvements	1,472,393
Total	1,684,429
Costs Capitalized Subsequent to Acquisition	0
Land	212,036
Buildings & Improvements	1,472,393
Total	1,684,429
Accumulated Depreciation and Amortization	(160,948)
Net	1,523,481
Dollar General
Real Estate [Line Items]
Encumbrances	640,014
Land	217,912
Buildings & Improvements	1,088,678
Total	1,306,590
Costs Capitalized Subsequent to Acquisition	0
Land	217,912
Buildings & Improvements	1,088,678
Total	1,306,590
Accumulated Depreciation and Amortization	(120,834)
Net	1,185,756
Dollar General
Real Estate [Line Items]
Encumbrances	634,809
Land	283,578
Buildings & Improvements	1,002,457
Total	1,286,035
Costs Capitalized Subsequent to Acquisition	0
Land	283,578
Buildings & Improvements	1,002,457
Total	1,286,035
Accumulated Depreciation and Amortization	(115,853)
Net	1,170,182
Dollar General
Real Estate [Line Items]
Encumbrances	634,809
Land	176,515
Buildings & Improvements	1,037,214
Total	1,213,729
Costs Capitalized Subsequent to Acquisition	0
Land	176,515
Buildings & Improvements	1,037,214
Total	1,213,729
Accumulated Depreciation and Amortization	(118,901)
Net	1,094,828
Dollar General
Real Estate [Line Items]
Encumbrances	634,809
Land	154,676
Buildings & Improvements	1,033,818
Total	1,188,494
Costs Capitalized Subsequent to Acquisition	0
Land	154,676
Buildings & Improvements	1,033,818
Total	1,188,494
Accumulated Depreciation and Amortization	(115,524)
Net	1,072,970
Dana
Real Estate [Line Items]
Encumbrances	4,551,250
Land	1,290,863
Buildings & Improvements	8,312,917
Total	9,603,780
Costs Capitalized Subsequent to Acquisition	0
Land	1,290,863
Buildings & Improvements	8,312,917
Total	9,603,780
Accumulated Depreciation and Amortization	(1,492,171)
Net	8,111,609
Northrop Grumman | Office
Real Estate [Line Items]
Encumbrances	5,666,866
Land	1,191,024
Buildings & Improvements	12,533,166
Total	13,724,190
Costs Capitalized Subsequent to Acquisition	0
Land	1,191,024
Buildings & Improvements	12,533,166
Total	13,724,190
Accumulated Depreciation and Amortization	(2,185,956)
Net	11,538,234
exp US Services
Real Estate [Line Items]
Encumbrances	3,385,353
Land	785,801
Buildings & Improvements	5,522,567
Total	6,308,368
Costs Capitalized Subsequent to Acquisition	136,547
Land	785,801
Buildings & Improvements	5,659,114
Total	6,444,915
Accumulated Depreciation and Amortization	(609,311)
Net	5,835,604
Harley
Real Estate [Line Items]
Encumbrances	6,748,029
Land	1,145,196
Buildings & Improvements	12,033,092
Total	13,178,288
Costs Capitalized Subsequent to Acquisition	0
Land	1,145,196
Buildings & Improvements	12,033,092
Total	13,178,288
Accumulated Depreciation and Amortization	(907,230)
Net	12,271,058
Wyndham
Real Estate [Line Items]
Encumbrances	5,716,200
Land	4,144,069
Buildings & Improvements	5,972,433
Total	10,116,502
Costs Capitalized Subsequent to Acquisition	959,213
Land	4,144,069
Buildings & Improvements	6,931,646
Total	11,075,715
Accumulated Depreciation and Amortization	(815,730)
Net	10,259,985
Williams-Sonoma
Real Estate [Line Items]
Encumbrances	4,530,600
Land	3,546,744
Buildings & Improvements	4,028,821
Total	7,575,565
Costs Capitalized Subsequent to Acquisition	1,054,532
Land	3,546,744
Buildings & Improvements	5,083,353
Total	8,630,097
Accumulated Depreciation and Amortization	(746,900)
Net	7,883,197
Omnicare
Real Estate [Line Items]
Encumbrances	4,273,552
Land	800,772
Buildings & Improvements	6,523,599
Total	7,324,371
Costs Capitalized Subsequent to Acquisition	219,818
Land	800,772
Buildings & Improvements	6,743,417
Total	7,544,189
Accumulated Depreciation and Amortization	(587,875)
Net	6,956,314
EMCOR
Real Estate [Line Items]
Encumbrances	2,862,484
Land	427,589
Buildings & Improvements	5,996,509
Total	6,424,098
Costs Capitalized Subsequent to Acquisition	0
Land	427,589
Buildings & Improvements	5,996,509
Total	6,424,098
Accumulated Depreciation and Amortization	(424,764)
Net	5,999,334
Husqvarna
Real Estate [Line Items]
Encumbrances	6,379,182
Land	974,663
Buildings & Improvements	11,879,485
Total	12,854,148
Costs Capitalized Subsequent to Acquisition	0
Land	974,663
Buildings & Improvements	11,879,485
Total	12,854,148
Accumulated Depreciation and Amortization	(756,557)
Net	12,097,591
AvAir
Real Estate [Line Items]
Encumbrances	14,575,000
Land	3,493,673
Buildings & Improvements	23,864,227
Total	27,357,900
Costs Capitalized Subsequent to Acquisition	0
Land	3,493,673
Buildings & Improvements	23,864,227
Total	27,357,900
Accumulated Depreciation and Amortization	(1,417,062)
Net	25,940,838
3M
Real Estate [Line Items]
Encumbrances	8,290,000
Land	758,780
Buildings & Improvements	16,360,400
Total	17,119,180
Costs Capitalized Subsequent to Acquisition	0
Land	758,780
Buildings & Improvements	16,360,400
Total	17,119,180
Accumulated Depreciation and Amortization	(2,231,246)
Net	14,887,934
Cummins
Real Estate [Line Items]
Encumbrances	8,458,600
Land	3,347,960
Buildings & Improvements	12,654,529
Total	16,002,489
Costs Capitalized Subsequent to Acquisition	0
Land	3,347,960
Buildings & Improvements	12,654,529
Total	16,002,489
Accumulated Depreciation and Amortization	(1,357,376)
Net	14,645,113
Northrop Grumman Parcel | Land
Real Estate [Line Items]
Encumbrances	0
Land	329,410
Buildings & Improvements	0
Total	329,410
Costs Capitalized Subsequent to Acquisition	0
Land	329,410
Buildings & Improvements	0
Total	329,410
Accumulated Depreciation and Amortization	0
Net	329,410
24 Hour Fitness
Real Estate [Line Items]
Encumbrances	6,283,898
Land	3,121,985
Buildings & Improvements	9,536,325
Total	12,658,310
Costs Capitalized Subsequent to Acquisition	31,448
Land	3,121,985
Buildings & Improvements	9,567,773
Total	12,689,758
Accumulated Depreciation and Amortization	(653,647)
Net	12,036,111
Texas Health
Real Estate [Line Items]
Encumbrances	4,400,000
Land	1,827,914
Buildings & Improvements	5,862,010
Total	7,689,924
Costs Capitalized Subsequent to Acquisition	0
Land	1,827,914
Buildings & Improvements	5,862,010
Total	7,689,924
Accumulated Depreciation and Amortization	(384,029)
Net	7,305,895
Bon Secours
Real Estate [Line Items]
Encumbrances	5,250,000
Land	1,658,659
Buildings & Improvements	9,184,248
Total	10,842,907
Costs Capitalized Subsequent to Acquisition	0
Land	1,658,659
Buildings & Improvements	9,184,248
Total	10,842,907
Accumulated Depreciation and Amortization	(526,238)
Net	10,316,669
Costco
Real Estate [Line Items]
Encumbrances	18,850,000
Land	8,202,915
Buildings & Improvements	21,825,853
Total	30,028,768
Costs Capitalized Subsequent to Acquisition	28,786
Land	8,202,915
Buildings & Improvements	21,854,639
Total	30,057,554
Accumulated Depreciation and Amortization	(1,352,612)
Net	28,704,942
Taylor Fresh Foods
Real Estate [Line Items]
Encumbrances	12,350,000
Land	4,312,016
Buildings & Improvements	32,776,370
Total	37,088,386
Costs Capitalized Subsequent to Acquisition	0
Land	4,312,016
Buildings & Improvements	32,776,370
Total	37,088,386
Accumulated Depreciation and Amortization	(275,349)
Net	36,813,037
Chevron Gas Station, San Jose
Real Estate [Line Items]
Encumbrances	0
Land	3,787,021
Buildings & Improvements	349,180
Total	4,136,201
Costs Capitalized Subsequent to Acquisition	64,135
Land	3,787,021
Buildings & Improvements	413,315
Total	4,200,336
Accumulated Depreciation and Amortization	0
Net	4,200,336
Levins
Real Estate [Line Items]
Encumbrances	2,079,793
Land	1,404,863
Buildings & Improvements	3,204,715
Total	4,609,578
Costs Capitalized Subsequent to Acquisition	41,739
Land	1,404,863
Buildings & Improvements	3,246,454
Total	4,651,317
Accumulated Depreciation and Amortization	0
Net	4,651,317
Chevron Gas Station, Roseville
Real Estate [Line Items]
Encumbrances	0
Land	2,636,663
Buildings & Improvements	899,927
Total	3,536,590
Costs Capitalized Subsequent to Acquisition	248,396
Land	2,636,663
Buildings & Improvements	1,148,323
Total	3,784,986
Accumulated Depreciation and Amortization	0
Net	3,784,986
Island Pacific Supermarket
Real Estate [Line Items]
Encumbrances	1,891,225
Land	676,981
Buildings & Improvements	1,877,222
Total	2,554,203
Costs Capitalized Subsequent to Acquisition	203,603
Land	676,981
Buildings & Improvements	2,080,825
Total	2,757,806
Accumulated Depreciation and Amortization	0
Net	2,757,806
Dollar General
Real Estate [Line Items]
Encumbrances	2,324,338
Land	1,099,458
Buildings & Improvements	3,824,688
Total	4,924,146
Costs Capitalized Subsequent to Acquisition	237,198
Land	1,099,458
Buildings & Improvements	4,061,886
Total	5,161,344
Accumulated Depreciation and Amortization	0
Net	5,161,344
Rite Aid
Real Estate [Line Items]
Encumbrances	3,659,338
Land	3,939,724
Buildings & Improvements	3,118,185
Total	7,057,909
Costs Capitalized Subsequent to Acquisition	204,621
Land	3,939,724
Buildings & Improvements	3,322,806
Total	7,262,530
Accumulated Depreciation and Amortization	0
Net	7,262,530
PMI Preclinical
Real Estate [Line Items]
Encumbrances	4,118,613
Land	4,774,497
Buildings & Improvements	5,243,803
Total	10,018,300
Costs Capitalized Subsequent to Acquisition	62,099
Land	4,774,497
Buildings & Improvements	5,305,902
Total	10,080,399
Accumulated Depreciation and Amortization	0
Net	10,080,399
EcoThrift
Real Estate [Line Items]
Encumbrances	2,639,237
Land	2,300,717
Buildings & Improvements	3,103,932
Total	5,404,649
Costs Capitalized Subsequent to Acquisition	419,423
Land	2,300,717
Buildings & Improvements	3,523,355
Total	5,824,072
Accumulated Depreciation and Amortization	0
Net	5,824,072
GSA (MSHA)
Real Estate [Line Items]
Encumbrances	1,796,361
Land	399,062
Buildings & Improvements	2,869,790
Total	3,268,852
Costs Capitalized Subsequent to Acquisition	86,531
Land	399,062
Buildings & Improvements	2,956,321
Total	3,355,383
Accumulated Depreciation and Amortization	0
Net	3,355,383
PreK Education
Real Estate [Line Items]
Encumbrances	5,140,343
Land	963,044
Buildings & Improvements	11,411,964
Total	12,375,008
Costs Capitalized Subsequent to Acquisition	520,206
Land	963,044
Buildings & Improvements	11,932,170
Total	12,895,214
Accumulated Depreciation and Amortization	0
Net	12,895,214
Dollar Tree
Real Estate [Line Items]
Encumbrances	0
Land	159,829
Buildings & Improvements	1,020,053
Total	1,179,882
Costs Capitalized Subsequent to Acquisition	213,783
Land	159,829
Buildings & Improvements	1,233,836
Total	1,393,665
Accumulated Depreciation and Amortization	0
Net	1,393,665
Dinan Cars
Real Estate [Line Items]
Encumbrances	2,710,834
Land	2,453,420
Buildings & Improvements	3,522,337
Total	5,975,757
Costs Capitalized Subsequent to Acquisition	276,900
Land	2,453,420
Buildings & Improvements	3,799,237
Total	6,252,657
Accumulated Depreciation and Amortization	0
Net	6,252,657
Solar Turbines
Real Estate [Line Items]
Encumbrances	2,843,863
Land	2,483,960
Buildings & Improvements	4,722,578
Total	7,206,538
Costs Capitalized Subsequent to Acquisition	210,729
Land	2,483,960
Buildings & Improvements	4,933,307
Total	7,417,267
Accumulated Depreciation and Amortization	0
Net	7,417,267
Wood Group
Real Estate [Line Items]
Encumbrances	3,478,480
Land	3,461,256
Buildings & Improvements	6,358,532
Total	9,819,788
Costs Capitalized Subsequent to Acquisition	304,387
Land	3,461,256
Buildings & Improvements	6,662,919
Total	10,124,175
Accumulated Depreciation and Amortization	0
Net	10,124,175
ITW Rippey
Real Estate [Line Items]
Encumbrances	3,112,349
Land	787,945
Buildings & Improvements	6,392,126
Total	7,180,071
Costs Capitalized Subsequent to Acquisition	195,459
Land	787,945
Buildings & Improvements	6,587,585
Total	7,375,530
Accumulated Depreciation and Amortization	0
Net	7,375,530
Dollar General
Real Estate [Line Items]
Encumbrances	611,161
Land	103,838
Buildings & Improvements	1,114,728
Total	1,218,566
Costs Capitalized Subsequent to Acquisition	139,468
Land	103,838
Buildings & Improvements	1,254,196
Total	1,358,034
Accumulated Depreciation and Amortization	0
Net	1,358,034
Gap
Real Estate [Line Items]
Encumbrances	3,643,166
Land	2,076,754
Buildings & Improvements	5,715,144
Total	7,791,898
Costs Capitalized Subsequent to Acquisition	946,755
Land	2,076,754
Buildings & Improvements	6,661,899
Total	8,738,653
Accumulated Depreciation and Amortization	0
Net	8,738,653
L-3 Communications
Real Estate [Line Items]
Encumbrances	5,284,884
Land	3,552,878
Buildings & Improvements	8,099,339
Total	11,652,217
Costs Capitalized Subsequent to Acquisition	433,675
Land	3,552,878
Buildings & Improvements	8,533,014
Total	12,085,892
Accumulated Depreciation and Amortization	0
Net	12,085,892
Sutter Health
Real Estate [Line Items]
Encumbrances	14,161,776
Land	2,443,240
Buildings & Improvements	26,690,356
Total	29,133,596
Costs Capitalized Subsequent to Acquisition	2,038,069
Land	2,443,240
Buildings & Improvements	28,728,425
Total	31,171,665
Accumulated Depreciation and Amortization	0
Net	31,171,665
Walgreens
Real Estate [Line Items]
Encumbrances	3,000,000
Land	1,832,430
Buildings & Improvements	3,512,156
Total	5,344,586
Costs Capitalized Subsequent to Acquisition	214,801
Land	1,832,430
Buildings & Improvements	3,726,957
Total	5,559,387
Accumulated Depreciation and Amortization	0
Net	$ 5,559,387