ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)				12 Months Ended
	Jun. 04, 2021	Nov. 01, 2020 USD ($) $ / shares	Oct. 01, 2020 USD ($) ft²	Sep. 30, 2021 USD ($) ft² Integer $ / shares shares	Sep. 30, 2020 USD ($) Integer shares	Sep. 30, 2019 USD ($) shares	Nov. 05, 2021 $ / shares	Nov. 30, 2019 USD ($)	Nov. 15, 2019 USD ($)	Sep. 30, 2018 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of real estate properties owned | Integer				122
Operating lease, weighted average remaining lease term				7 years
Average base rent per square foot | $ / shares				$ 6.61
Overall occupancy rate, description				Our overall occupancy rate has been 98.9% or above for over six consecutive years.
Occupancy rate				99.70%
Weighted average building age, term				10 years 2 months 12 days
weighted average fixed rate mortgage debt maturity				10 years 10 months 24 days
Average base rent collected during COVID				99.90%
Non-controlling interests percentage				For real estate investments that the Company consolidates but does not own 100% interest, any resulting non-controlling interest, if considered material, is presented as a component of shareholders equity on its Consolidated Balance Sheet, and the portion of earnings or loss attributable to non-controlling interest is presented separately in the Consolidated Statements of Income (Loss).
Marketable Securities				$ 143,500,000
Percentage of REIT securities of gross assets				0.056
Accumulated other comprehensive income (loss)				$ (2,230,000)	$ (4,368,000)					$ (24,700,000)
Weighted average amortization period upon acquisition for intangible assets				17 years	14 years	12 years
Amortization expense related to deferred leasing and financing costs				$ 2,700,000	$ 2,600,000	$ 2,200,000
Amortization expense for existing assets in year 2022				2,500,000
Amortization expense for existing assets in year 2023				2,400,000
Amortization expense for existing assets in year 2024				1,800,000
Amortization expense for existing assets in year 2025				1,400,000
Amortization expense for existing assets in year 2026				1,400,000
Term loan				75,000,000					$ 75,000,000.0
Fair value of interest rate swap				2,200,000
Straight line annualized rent				$ 3,024,000	$ 1,976,000	$ 1,926,000
Lease termination income description				Only three of our 122 properties have leases that contain an early termination provision. These three properties contain 177,000 total rentable square feet, representing less than 1% of our total rentable square feet. Our leases with early termination provisions are our 36,000 square foot location in Urbandale (Des Moines), IA, our 39,000 square foot location in Rockford, IL, and our 102,000 square foot location in O’Fallon (St. Louis), MO.
Common stock equivalents included in the diluted weighted average shares outstanding | shares				190,000	82,000	98,000
Stock compensation expense				$ 287,000	$ 452,000	$ 784,000
Deduction percentage on aggregate amount of qualified REIT dividends from taxable income				20.00%
Four Tenants [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Potential termination fees, early termination provision				$ 1,500,000
Interest Rate Swap Agreement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Term loan								$ 75,000,000.0
Stock Options [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of antidilutive options to purchase shares | shares				65,000	315,000	305,000
Building [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Property, plant and equipment, useful life				39 years
Building Improvements [Member] | Minimum [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Property, plant and equipment, useful life				3 years
Building Improvements [Member] | Maximum [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Property, plant and equipment, useful life				39 years
I L P T [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Business Acquisition, Planned Restructuring Activities, Description				on November 5, 2021, we entered into a definitive merger agreement with Industrial Logistics Properties Trust, a Maryland real estate investment trust (“ILPT”), under which, on the terms and subject to the conditions set forth in the merger agreement, ILPT will acquire us in an all-cash transaction, with our common stockholders receiving $21.00 in cash for each outstanding share of our common stock in connection with consummation of the transaction. ILPT’s acquisition of us is subject to obtaining the requisite approval of our common stockholders and the satisfaction of other customary closing conditions. Upon closing of the merger with ILPT, holders of our outstanding 6.125% Series C Cumulative Redeemable Preferred Stock (“Series C Preferred Stock”) will receive the amount of $25 per share plus any accrued and unpaid dividends. We plan to continue to pay our regular quarterly common stock dividend and our Series C Cumulative Redeemable Preferred Stock dividend for each full quarterly dividend period completed prior to the closing of the transaction. This transaction with ILPT represents the culmination of the publicly announced comprehensive strategic alternatives review processes conducted by our Board of Directors during 2021. Our Board re-initiated its strategic alternatives review process in September 2021 after a previous agreement for a merger that we entered into with another party, following a strategic alternatives review process earlier this year, did not receive the requisite approval of our stockholders.
Industrial Logistics Properties Trust [Member] | Subsequent Event [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Per share of common stock outstanding | $ / shares							$ 21.00
US Industrial Real Estate [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Occupancy rate				96.00%
Seven Consecutive Years [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating lease, weighted average remaining lease term				7 years
Six Consecutive Years [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Occupancy rate				98.90%
Rent Effective Date On April One Twenty Twenty One [Member] | Lease Termination Agreement [Member] | RGH Enterprises, Inc [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of building | ft²			75,000
Lease, termination fee			$ 377,000
Lease expiration date			Nov. 30, 2021
Rent Effective Date on April 1, 2021 [Member] | New Lease United Parcel Service Inc [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Lease agreement, description		(UPS) which became effective November 1, 2020. The lease agreement with UPS provides for five months of free rent, after which, on April 1, 2021
Initial Annual Rent		$ 510,000
Rent, per sq.ft | $ / shares		$ 6.80
Rent, annual increase percentage		2.00%
Thereafter April 1, 2021 [Member] | New Lease United Parcel Service Inc [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Lease expiration date		Mar. 31, 2031
Rent, per sq.ft | $ / shares		$ 7.21
Straight line annualized rent		$ 541,000
Straight-Line Rent [Member] | New Lease United Parcel Service Inc [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Rent, annual increase percentage	2.00%
Prior tenant lease agreement, description		This compares to the former U.S. GAAP straight-line rent of $574,000, representing $7.65 per square foot, and former cash rent of $8.19 per square foot, resulting in a decrease of $33,000, representing a 5.8% decrease on a U.S. GAAP straight-line basis and a decrease of 17.0% on a cash basis. The new 10.4 year lease agreement with UPS provides for an additional 9.3 years of lease term versus the old lease with Cardinal Health.
New tenant, amended lease agreement, description	effective June 4, 2021, we completed a parking lot expansion at this location for a cost of approximately $835,000 resulting in an initial increase in annual rent effective on the date of completion of approximately $52,000 from approximately $510,000, or $6.80 per square foot, to approximately $562,000, or $7.50 per square foot. Furthermore, annual rent will continue to increase each year by 2.0% resulting in an annualized rent from June 4, 2021 through the remaining term of the lease of approximately $622,000, or $8.29 per square foot.
Wholly Owned Properties [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of real estate properties owned | Integer				122	119
Three Properties [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total square foot of property | ft²				177,000
Urbandale (Des Moines) [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total square foot of property | ft²				36,000
Rockford, IL [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total square foot of property | ft²				39,000
Fallon St Louis MO [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total square foot of property | ft²				102,000