Schedule III - Real Estate and Related Depreciation (Details)	Dec. 31, 2018 USD ($) ft²
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	765,508
Initial cost, Land	$ 5,493,814
Initial cost, Buildings & Improvements	48,240,686
Costs Subsequent to Acquisition	3,151,119
Gross Carrying Amount, Land	5,493,814
Gross Carrying Amount, Buildings & Improvements	51,391,805
Total	56,885,619
Accumulated Depreciation	$ 3,509,743
Clinton, CT
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	30,338	[1]
Initial cost, Land	$ 356,040	[1]
Initial cost, Buildings & Improvements	3,108,285	[1]
Costs Subsequent to Acquisition	14,197	[1]
Gross Carrying Amount, Land	356,040	[1]
Gross Carrying Amount, Buildings & Improvements	3,122,482	[1]
Total	3,478,522	[1]
Accumulated Depreciation	$ 154,983	[1]
Bolingbrook, IL
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	113,700	[2]
Initial cost, Land	$ 633,914	[2]
Initial cost, Buildings & Improvements	5,491,409	[2]
Costs Subsequent to Acquisition	2,439,850	[2]
Gross Carrying Amount, Land	633,914	[2]
Gross Carrying Amount, Buildings & Improvements	7,931,259	[2]
Total	8,565,173	[2]
Accumulated Depreciation	$ 591,922	[2]
Dolton, IL
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	86,590	[2]
Initial cost, Land	$ 614,413	[2]
Initial cost, Buildings & Improvements	5,227,313	[2]
Costs Subsequent to Acquisition	9,611	[2]
Gross Carrying Amount, Land	614,413	[2]
Gross Carrying Amount, Buildings & Improvements	5,236,924	[2]
Total	5,851,337	[2]
Accumulated Depreciation	$ 419,280	[2]
McCordsville, IN
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	81,646	[1]
Initial cost, Land	$ 770,000	[1]
Initial cost, Buildings & Improvements	6,776,000	[1]
Costs Subsequent to Acquisition	46,578	[1]
Gross Carrying Amount, Land	770,000	[1]
Gross Carrying Amount, Buildings & Improvements	6,822,578	[1]
Total	7,592,578	[1]
Accumulated Depreciation	$ 385,529	[1]
Merrillville, IN
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	80,270	[2]
Initial cost, Land	$ 597,229	[2]
Initial cost, Buildings & Improvements	5,104,011	[2]
Costs Subsequent to Acquisition	464,324	[2]
Gross Carrying Amount, Land	597,229	[2]
Gross Carrying Amount, Buildings & Improvements	5,568,335	[2]
Total	6,165,564	[2]
Accumulated Depreciation	$ 418,979	[2]
Millbrook, NY
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	12,676	[1]
Initial cost, Land	$ 423,960	[1]
Initial cost, Buildings & Improvements	2,900,895	[1]
Costs Subsequent to Acquisition	36,213	[1]
Gross Carrying Amount, Land	423,960	[1]
Gross Carrying Amount, Buildings & Improvements	2,937,108	[1]
Total	3,361,068	[1]
Accumulated Depreciation	$ 135,170	[1]
Rochester, NY
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	68,076	[2]
Initial cost, Land	$ 571,583	[2]
Initial cost, Buildings & Improvements	5,227,630	[2]
Gross Carrying Amount, Land	571,583	[2]
Gross Carrying Amount, Buildings & Improvements	5,227,630	[2]
Total	5,799,213	[2]
Accumulated Depreciation	$ 379,069	[2]
Lima, OH
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	97,610	[1]
Initial cost, Land	$ 530,000	[1]
Initial cost, Buildings & Improvements	4,664,000	[1]
Costs Subsequent to Acquisition	96,417	[1]
Gross Carrying Amount, Land	530,000	[1]
Gross Carrying Amount, Buildings & Improvements	4,760,417	[1]
Total	5,290,417	[1]
Accumulated Depreciation	$ 276,488	[1]
Sadsburyville, PA
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	78,842	[2]
Initial cost, Land	$ 462,749	[2]
Initial cost, Buildings & Improvements	5,146,579	[2]
Costs Subsequent to Acquisition	23,729	[2]
Gross Carrying Amount, Land	462,749	[2]
Gross Carrying Amount, Buildings & Improvements	5,170,308	[2]
Total	5,633,057	[2]
Accumulated Depreciation	$ 406,432	[2]
SSG Summerville I LLC | Summerville, SC
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	72,700	[2],[3]
Initial cost, Land	$ 345,160	[2]
Initial cost, Buildings & Improvements	2,989,159	[2]
Costs Subsequent to Acquisition	5,475	[2]
Gross Carrying Amount, Land	345,160	[2]
Gross Carrying Amount, Buildings & Improvements	2,994,634	[2]
Total	3,339,794	[2]
Accumulated Depreciation	$ 221,342	[2]
SSG Summerville II LLC | Summerville, SC
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	43,060	[2],[4]
Initial cost, Land	$ 188,766	[2]
Initial cost, Buildings & Improvements	1,605,405	[2]
Costs Subsequent to Acquisition	14,725	[2]
Gross Carrying Amount, Land	188,766	[2]
Gross Carrying Amount, Buildings & Improvements	1,620,130	[2]
Total	1,808,896	[2]
Accumulated Depreciation	$ 120,549	[2]

[1] This property is part of the Revolver as of December 31, 2018

[2] This property is part of the Loan Agreement with a balance of $19,809,511 as of December 31, 2018.

[3] SSG Summerville I LLC.

[4] SSG Summerville II LLC