Contingencies and Commitments (Details Narrative)	6 Months Ended
	Mar. 31, 2018 USD ($) ft²
Contingencies and Commitments [Line Items]
Expected gain loss on sale of properties	$ 5,388,000
FedEx Ground Package System, Inc [Member]
Contingencies and Commitments [Line Items]
Expansion costs	1,834,000
Increase in annualized rent	$ 183,000
Lease extension term from the date of completion	10 years
FedEx Ground Package System, Inc [Member] | Minimum [Member]
Contingencies and Commitments [Line Items]
Increase in annualized rent	$ 1,415,000
FedEx Ground Package System, Inc [Member] | Maximum [Member]
Contingencies and Commitments [Line Items]
Increase in annualized rent	$ 1,598,000
Industrial Building [Member]
Contingencies and Commitments [Line Items]
Mortgage loans amortization period	15 years
Mortgage loans committed on real estate, carrying amount of mortgage	$ 29,860,000
Fixed interest rate, percentage	3.82%
Properties One [Member]
Contingencies and Commitments [Line Items]
Area of buildings | ft²	87,500
Expected proceeds from sale of buildings	$ 6,400,000
Expected gain loss on sale of properties	$ 2,400,000
Properties Two [Member]
Contingencies and Commitments [Line Items]
Area of buildings | ft²	68,370
Expected proceeds from sale of buildings	$ 5,800,000
Property Purchase Agreement [Member] | Industrial Building [Member]
Contingencies and Commitments [Line Items]
Area of buildings | ft²	624,000
Weighted average lease maturity term	12 years 3 months 19 days
Aggregate purchase price of industrial properties	$ 80,863,000
Property Purchase Agreement [Member] | Amazon Fulfillment Services, Inc [Member]
Contingencies and Commitments [Line Items]
Area of buildings | ft²	363,000
Property Purchase Agreement [Member] | FedEx Ground Package System, Inc [Member]
Contingencies and Commitments [Line Items]
Area of buildings | ft²	261,000