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Income Taxes - Tax carryforward and reconciliation of unrecognized tax benefit (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Tax credit carryforward
Change in valuation allowance	$ 700,000	$ 1,700,000
Valuation allowance	4,296,553	3,568,459	$ 5,297,757
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits
Balance at beginning of year	570,000	615,000	615,000
Unrecognized tax benefits related to prior years	52,000		(2,000)
Unrecognized tax benefits related to current year	11,000	18,000	26,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations	(93,000)	(63,000)	(24,000)
Balance at end of year	540,000	570,000	615,000
Unrecognized tax benefits , if recognized, would impact effective tax rate	540,000	570,000	615,000
Unrecognized tax benefits against accrued interest	0
Accrual recorded for penalties	0
(Benefit) expense for interest (net of federal impact) recognized	0	0	$ (3,000)
Adjustments resulting from IRS examination	0
R&D | Federal
Tax credit carryforward
Tax Credit carryforwards	$ 1,319,000	1,236,000
R&D | State
Tax credit carryforward
Gain on sale of Tax credits		$ 669,000

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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