Note 14 - Income Taxes (Tables)

12 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Years ended September 30,
	2021		2020
Current tax provision
Federal	$	-	$	-
State		1		2
Total current tax provision		1		2
Deferred provision
Federal		368		(4,852	)
State		65		(856	)
Total deferred provision		433		(5,708	)
Provision (benefit) for income taxes	$	434	$	(5,706	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Years ended September 30,
	2021			2020
Income taxes computed at the federal statutory rate	$	239		$	1,296
Change in valuation allowance		435			(7,134	)
Nondeductible compensation, interest expense and other		57			24
State income taxes, net of federal tax benefit		210			364
Change in R&D credit carryover		19			(219	)
Stock options and other prior year true-ups		(175	)		(7	)
Foreign rate differential		(117	)		(21	)
State business credit utilization		(234	)		(9	)
Provision (benefit) for income taxes	$	434		$	(5,706	)

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	At September 30,
	2021			2020
Deferred tax assets
Net operating loss carryforwards	$	11,769		$	11,985
Research and development credit		5,479			5,686
Share-based compensation		538			317
Patents		8			15
Accruals and other		2,487			2,526
Allowances		237			183
Gross deferred tax asset		20,518			20,712
Deferred tax liabilities
Equipment		(352	)		(405	)
Operating ROU assets		(1,222	)		(1,334	)
Acquired intangible assets		(2,592	)		-
Gross deferred tax liabilities		(4,166	)		(1,739	)
Less valuation allowance		(8,313	)		(7,878	)
Total deferred tax assets, net of valuation allowance	$	8,039		$	11,095