Schedule III - Real Estate and Related Depreciation (Details)	Dec. 31, 2019 USD ($) ft²
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	832,008
Initial cost, Land	$ 6,122,065
Initial cost, Buildings & Improvements	53,470,167
Costs Subsequent to Acquisition	6,211,205
Gross Carrying Amount, Land	6,122,065
Gross Carrying Amount, Buildings & Improvements	59,419,039
Total	65,541,104
Accumulated Depreciation	$ 6,264,236
Clinton, CT
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	30,408	[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	$ 309,989	[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	2,456,374	[2]
Gross Carrying Amount, Land	633,914	[2]
Gross Carrying Amount, Buildings & Improvements	7,947,783	[2]
Total	8,581,697	[2]
Accumulated Depreciation	$ 1,006,053	[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	$ 696,926	[2]
McCordsville, IN
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	76,360	[1]
Initial cost, Land	$ 770,000	[1]
Initial cost, Buildings & Improvements	6,776,000	[1]
Costs Subsequent to Acquisition	474,336	[1]
Gross Carrying Amount, Land	770,000	[1]
Gross Carrying Amount, Buildings & Improvements	7,250,336	[1]
Total	8,020,336	[1]
Accumulated Depreciation	$ 732,035	[1]
Merrillville, IN
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	80,570	[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	$ 712,701	[2]
Millbrook, NY
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	24,472	[1]
Initial cost, Land	$ 423,960	[1]
Initial cost, Buildings & Improvements	2,900,895	[1]
Costs Subsequent to Acquisition	2,343,125	[1]
Gross Carrying Amount, Land	423,960	[1]
Gross Carrying Amount, Buildings & Improvements	5,244,020	[1]
Total	5,667,980	[1]
Accumulated Depreciation	$ 330,581	[1]
Rochester, NY
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	68,126	[2]
Initial cost, Land	$ 571,583	[2]
Initial cost, Buildings & Improvements	5,227,630	[2]
Costs Subsequent to Acquisition	22,503	[2]
Gross Carrying Amount, Land	571,583	[2]
Gross Carrying Amount, Buildings & Improvements	5,250,133	[2]
Total	5,821,716	[2]
Accumulated Depreciation	$ 656,730	[2]
Lima, OH
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	98,055	[1]
Initial cost, Land	$ 530,000	[1]
Initial cost, Buildings & Improvements	4,664,000	[1]
Costs Subsequent to Acquisition	112,915	[1]
Gross Carrying Amount, Land	530,000	[1]
Gross Carrying Amount, Buildings & Improvements	4,776,915	[1]
Total	5,306,915	[1]
Accumulated Depreciation	$ 514,747	[1]
Sadsburyville, PA
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	78,857	[2]
Initial cost, Land	$ 462,749	[2]
Initial cost, Buildings & Improvements	5,146,579	[2]
Costs Subsequent to Acquisition	28,362	[2]
Gross Carrying Amount, Land	462,749	[2]
Gross Carrying Amount, Buildings & Improvements	5,174,941	[2]
Total	5,637,690	[2]
Accumulated Depreciation	$ 687,125	[2]
West Henrietta, NY
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	55,550	[1]
Initial cost, Land	$ 628,251	[1]
Initial cost, Buildings & Improvements	5,229,481	[1]
Costs Subsequent to Acquisition	262,333	[1]
Gross Carrying Amount, Land	628,251	[1]
Gross Carrying Amount, Buildings & Improvements	5,229,481	[1]
Total	5,857,732	[1]
Accumulated Depreciation	$ 32,148	[1]
SSG Summerville I LLC | Summerville, SC
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	76,560	[2],[3]
Initial cost, Land	$ 345,160	[2]
Initial cost, Buildings & Improvements	2,989,159	[2]
Costs Subsequent to Acquisition	8,400	[2]
Gross Carrying Amount, Land	345,160	[2]
Gross Carrying Amount, Buildings & Improvements	2,997,559	[2]
Total	3,342,719	[2]
Accumulated Depreciation	$ 379,348	[2]
SSG Summerville II LLC | Summerville, SC
Real Estate And Accumulated Depreciation [Line Items]
Square Footage | ft²	42,760	[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	$ 205,853	[2]

[1] This property is held as collateral under the Revolver with an outstanding balance of $5,144,000 as of December 31, 2020

[2] This property is held as collateral under the Loan Agreement with an outstanding balance of $18,847,475 as of December 31, 2020.

[3] SSG Summerville I LLC.

[4] SSG Summerville II LLC