Contingencies and Commitments (Details) (USD $)	6 Months Ended
	Mar. 31, 2013
Contingencies and Commitments (Textual)
Revolving credit facility interest at LIBOR plus	2.00%
Renewed revolving credit facility interest at LIBOR plus	2.00%
Commitment to renew and increase unsecured revolving credit facility	$ 20,000,000
Renewed credit facility increased	40,000,000
Renewed credit facility increased accordion feature	60,000,000
Unsecured revolving credit facility mature	June 2013
Renewed unsecured revolving credit facility mature	June 2016
Term of extension option	1 year
Maximum [Member]
Contingencies and Commitments (Textual)
Revolving credit facility interest at LIBOR plus	2.50%
Renewed revolving credit facility interest at LIBOR plus	2.50%
Minimum [Member]
Contingencies and Commitments (Textual)
Revolving credit facility interest at LIBOR plus	2.00%
Renewed revolving credit facility interest at LIBOR plus	1.75%
Agreement One [Member]
Contingencies and Commitments (Textual)
Number of industrial properties acquired by company	8
Area of building (in square foot)	1,420,000
Lease period of industrial properties acquired	10 or more years
Area to be leased to FedEx Ground Packaging Systems	862,000
Percentage of building area leased to FedEx Ground Package Systems, Inc	61.00%
Aggregate purchase price of eight properties	96,105,000
Anticipated period for closer of transactions	Fiscal 2013 and fiscal 2014
Deposits on acquisitions included in other assets	1,800,000
Number of separate commitments	3
Mortgage loans on real estate, carrying amount of mortgages	37,475,000
Minimum interest rate in range	3.84%
Maximum interest rate in range	4.17%
Periodic payment terms	Between 13 and 20 years
Commitment and loan processing fees	434,250
Commitment and loan processing fees refunded at each respective closing	416,250
Agreement Two [Member]
Contingencies and Commitments (Textual)
Area of building (in square foot)	170,000
Number of existing buildings to be expanded by company	3
Purchase price of land acquired	988,300
Expansion costs	3,900,000
Expected remaining expansion costs	10,100,000
Expected expansion cost per square foot	83
Increased rent after completion of expansions	1,400,000
Extension in lease period after building expansions, in years	10 years
Increased rent after completion of expansions average per square foot	$ 8.20