Organization and Accounting Policies (Details Narrative)				3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) ft² a Properties $ / shares shares	Dec. 22, 2017 USD ($)	Dec. 18, 2017 USD ($)	Mar. 31, 2018 USD ($) ft² a Properties $ / shares shares	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) ft² a Properties $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 a Properties
Number of real estate properties owned | Properties	109			109		109		108
Total square foot of property | a	19,928,000			19,928,000		19,928,000		18,790,000
Percentage of properties occupied						99.20%		99.30%
Weighted average building age						7 years 9 months 18 days
Annualized average base rent per square foot | $ / shares	$ 5.91			$ 5.91		$ 5.91
REIT investment securities, description						We also own a portfolio of REIT investment securities, which we generally limit to no more than approximately 10% of our undepreciated assets (which is our total assets, excluding accumulated depreciation).
Total gross real estate investments	$ 1,748,202,329			$ 1,748,202,329		$ 1,748,202,329
Marketable REIT securities investments						$ 144,630,426
Percentage of undepreciated assets						8.30%
Gain on real estate properties						$ 5,388,000
Percentage of gain on properties	105.00%			105.00%		105.00%
Net gain on historic cost						$ 1,804,000
Percentage of net gain over the historic cost basis	21.00%			21.00%		21.00%
Potential lease termination income							$ 0
Stock based compensation expense				$ 111,407	$ 166,190	$ 242,170	$ 266,345
Weighted average fair value of stock option | $ / shares						$ 1.84	$ 1.49
Number Restricted stock shares granted | shares						12,500	0
Weighted average exercise price per share | $ / shares						$ 14.24
Total proceeds						$ 569,600	$ 0
Number of stock option exercised | shares						40,000	0
Stock option shares available for grant | shares	1,673,706			1,673,706		1,673,706
Option to purchase shares outstanding | shares						695,000
Aggregate intrinsic value of options	$ 2,171,900			$ 2,171,900		$ 2,171,900
Four Lease [Member]
Potential lease termination income						$ 1,681,000
Kansas City, MO (Kellogg) [Member]
Total square foot of property | a	65,067			65,067		65,067
Value of property sold			$ 4,900,000
Proceeds from sale of property			$ 4,602,000
Percentage of weighted average lease termination income						80.00%
Orangeburg NY [Member]
Total square foot of property | ft²	50,400			50,400		50,400
Value of property sold		$ 6,170,000
Proceeds from sale of property		$ 5,898,000
Kansas City, MO and Orangeburg, NY [Member]
Percentage of weighted average lease termination income						80.00%
Four Properties [Member]
Total square foot of property | a	184,000			184,000		184,000
Percentage of properties occupied	1.00%
Ridgeland (Jackson), MS [Member]
Total square foot of property | a	26,340			26,340		26,340
Urbandale (Des Moines), IA [Member]
Total square foot of property | a	36,270			36,270		36,270
Rockford, IL (Sherwin-Williams Co.) [Member]
Total square foot of property | a	38,833			38,833		38,833
Roanoke, VA (FDX Ground) [Member]
Total square foot of property | a	83,000			83,000		83,000
Buildings [Member]
Weighted average building age						9 years 2 months 12 days