Schedule II - Valuation and Qualifying Accounts - Summary of Valuation and Qualifying Accounts (Details) - USD ($)		3 Months Ended	12 Months Ended
		Dec. 31, 2018	Sep. 30, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at beginning of period		$ 60,275	$ 10,000
Additions charged to costs and expenses	[1]		275
Additions charged to other accounts	[2]
Deductions	[3]	(25,275)
Balance at end of period		35,000	10,275
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance at beginning of period		473,252	235,592
Additions charged to costs and expenses	[4]	56,261	284,352
Additions charged to other accounts		(303,201)
Deductions	[5]	(72,008)	(46,692)
Balance at end of period		226,492	473,252
SEC Schedule, 12-09, Reserve, Warranty [Member]
Balance at beginning of period		199,899
Additions charged to costs and expenses		419,460
Additions charged to other accounts
Deductions		(145,055)
Balance at end of period		474,304	0
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at beginning of period		47,319	500,000
Additions charged to costs and expenses
Additions charged to other accounts
Deductions
Balance at end of period		47,319	$ 500,000
Uncertain Tax Position Reserves [Member]
Balance at beginning of period		395,000
Additions charged to costs and expenses
Additions charged to other accounts
Deductions
Balance at end of period		$ 395,000

[1] Classified as bad debt expense

[2] Recoveries on accounts charged off in prior years

[3] Accounts charged off during year as uncollectible

[4] Reduction in inventory obsolescence reserve

[5] Inventory charged off during the year as obsolete