Debt (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Interest expense amortization of financing costs	$ 320	$ 303	$ 637	$ 596
Fixed rate mortgage notes payable, description			We owned 113 properties, of which 62 carried Fixed Rate Mortgage Notes Payable with outstanding principal balances totaling $762.3 million.
Fixed rate mortgage notes payable	762,300		$ 762,300
Weighted average interest rate percentage			4.07%	4.11%	4.07%
Notes payable maturity period			11 years 7 months 6 days	11 years 6 months	11 years 8 months 12 days
Proceeds from fixed rate mortgage notes payable			$ 72,500	$ 67,100
Drawn down margin loan	$ 19,800		$ 19,800
Maximum borrowing percentage of marketable securities	50.00%		50.00%
Securities available for sale at fair value	$ 177,359		$ 177,359		$ 154,921
Margin loan bearing interest rate	3.00%		3.00%
Line of Credit [Member]
Total availability of unsecured credit facility	$ 200,000		$ 200,000
Line of credit amount	110,000		110,000
Repayment of line of credit facility			$ 50,000
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 capitalization rate to the NOI generated by our unencumbered properties. Effective, March 22, 2018, the capitalization rate applied to our NOI generated by our unencumbered properties was lowered from 7.0% to 6.5%, thus increasing the value of the borrowing base properties under the terms of the agreement. Borrowings under the Facility, will, at our election, either i) bear interest at LIBOR plus 140 basis points to 220 basis points, depending on our leverage ratio, or ii) bear interest at BMO’s prime lending rate plus 40 basis points to 120 basis points, depending on our leverage ratio. Our borrowings as of March 31, 2019, based on our leverage ratio, bear interest at LIBOR plus 170 basis points, which represented an interest rate of 4.20%.
Line of credit facility related to accordion feature	$ 100,000		$ 100,000
Total potential available under unsecured line of credit			$ 300,000
Tampa, FL [Member]
Annual interest rate			6.00%
Mortgages paid off			$ 4,800
Lebanon, TN [Member] | Subsequent to the Quarter End [Member]
Annual interest rate			7.60%
Mortgages paid off			$ 7,100
Two Mortgages Loans [Member]
Weighted average interest rate percentage			4.20%
Mortgage loan amortization period			15 years
Proceeds from fixed rate mortgage notes payable			$ 72,500
Minimum [Member]
Annual interest rate			3.45%
Maximum [Member]
Annual interest rate			7.60%