Operating expenses (Details) - Operating expenses - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Expenses [Abstract]
Administrative salaries	$ 559,000	$ 512,873
Advertising and promotion	59,890	46,998
Auto and truck expense	122,501	119,826
Bad debts	1,857
Contract services	65,537	192,340
Corporation expense	68,720	54,199
Custodial supplies	25,289	29,805
Direct labor	1,771,028	1,751,553
Employee travel and training	34,810	31,675
Equipment lease	4,809	5,419
Insurance	589,551	666,850
Miscellaneous	88,456	57,237
Office supplies and expense	77,986	47,973
Payroll tax expense	203,047	182,563
Payroll service	41,243	39,794
Pension plan match	57,083	56,717
Professional services	103,582	93,855
Property taxes	215,809	210,273
Recreational supplies	4,069	14,570
Rent - storage lots	43,928	43,066
Repairs and maintenance	219,478	215,360
Retail operating supplies	6,124	3,030
Security	15,143	17,514
Service charges	154,877	138,628
Taxes and licenses	8,609	12,544
Telephone	37,024	50,792
Uniforms	26,056	28,580
Utilities	682,387	624,043
Total Operating Expenses	$ 5,287,893	$ 5,248,077