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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 5,686	$ 5,856
Deferred Tax Assets, Valuation Allowance, Total	7,878	$ 15,012
Unrecognized Tax Benefits, Ending Balance	0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 2,374
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Deferred Tax Assets, Net, Total	11,095
Operating Loss Carryforwards, Total	40,181
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,343
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 438

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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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