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Note 12 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	24.28%
Deferred Tax Assets, Net, Total	$ 5,957,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	5,805,000	$ 2,559,000
Deferred Tax Assets, Valuation Allowance, Total	15,017,000	$ 12,306,000
Unrecognized Tax Benefits, Ending Balance	0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	2,374,000
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	911,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	48,720,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 2,114,000

X

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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