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Note 13 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Net operating loss carryforwards	$ 11,985	$ 12,682
Deferred Tax Assets, Tax Credit Carryforwards, Research	5,686	5,856
Share-based compensation	317	506
Equipment	(405)	(78)
Patents	15	24
Accruals and other	2,526	1,222
State tax deduction		(6)
Federal AMT Credit		24
Allowances	183	169
Right of use asset	1,334
Gross deferred tax asset	18,973	20,399
Less valuation allowance	(7,878)	(15,012)
Total deferred tax assets, net of valuation allowance	$ 11,095	$ 5,387

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