Debt (Details Narrative) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Interest expense	$ 293,894	$ 280,913
Weighted average interest rate percentage	4.16%	4.44%	4.18%
Notes payable maturity period	11 years 6 months	10 years 8 months 12 days	11 years 7 months 6 days
Proceeds from fixed rate mortgage notes payable	$ 33,800,000	$ 38,000,000
Repayment of mortgage payable	$ 2,633,000
Margin loan bearing interest rate	2.00%
Maximum borrowing percentage of marketable securities	50.00%
Securities available for sale at fair value	$ 130,431,475		$ 123,764,770
Line of Credit [Member]
Total availability of unsecured credit facility	200,000,000
Line of credit amount	$ 110,000,000
Debt maturity date	Sep. 30, 2020
Line of credit facility interest rate terms	Availability under the Facility is limited to 60% of the value of the borrowing base properties. The value of the borrowing base properties is determined by applying a 7.0% capitalization rate to the NOI generated by the Company’s unencumbered, wholly-owned industrial properties. Borrowings under the Facility, will, at the Company’s election, either i) bear interest at LIBOR plus 140 basis points to 220 basis points, depending on the Company’s leverage ratio, or ii) bear interest at BMO’s prime lending rate plus 40 basis points to 120 basis points, depending on the Company’s leverage ratio. The Company’s borrowings as of December 31, 2017, based on the Company's leverage ratio as of December 31, 2017, bear interest at LIBOR plus 170 basis points, which was at an interest rate of 3.06% as of December 31, 2017.
Line of credit facility related to accordion feature	$ 100,000,000
Total potential available under unsecured line of credit	$ 300,000,000
One Mortgages Loans [Member]
Mortgage loan amortization period	15 years
Mortgages Loans [Member]
Mortgage loan amortization period	10 years
Mortgage loan amortizing over period	18 years
Two Mortgages Loans [Member]
Weighted average interest rate percentage	3.89%
Notes payable maturity period	12 years 1 month 6 days
Proceeds from fixed rate mortgage notes payable	$ 33,800,000
Minimum [Member]
Annual interest rate	3.45%
Maximum [Member]
Annual interest rate	7.60%