Note 11 - Income Taxes (Tables)

12 Months Ended

Jun. 30, 2022

Notes Tables

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

	Year Ended June 30,
(In thousands)	2022		2021
Current
Federal	$	—	$	—
State and local		—		—
Total current tax benefit	$	—	$	—
Deferred
Federal		—		—
State and local		—		—
Total deferred tax benefit	$	—	$	—
Total tax benefit	$	—	$	—

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

	Year Ended June 30,
(In thousands)	2022			2021
Expected benefit	$	1,749		$	1,596
State tax expense		—			—
Tax credits		166			187
Change in valuation allowance		(1,511	)		(1,352	)
Loan forgiveness - PPP loan		—			114
Stock-based compensation		(306	)		(36	)
Prior year true-up		(9	)		26
Expiration of net operating loss carryovers		(89	)		(533	)
Other permanent items		—			(2	)
Total income tax benefit	$	—		$	—

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

	Year Ended June 30,
(In thousands)	2022			2021
Deferred tax assets:
Net operating loss carryforwards	$	17,202		$	15,882
Tax credit carryforwards		1,330			1,165
Lease liability - current and non-current		113			62
Accrued expenses and other timing		180			65
Stock-based compensation		579			676
Property and equipment, principally due to differences in depreciation		—			77
Total gross deferred tax assets	$	19,404		$	17,927
Less — valuation allowance		(19,348	)		(17,875	)
Net deferred tax assets	$	56		$	52
Deferred tax liabilities:
Right-of-use assets	$	(34	)	$	(52	)
Property and equipment, principally due to differences in depreciation		(22	)		—
Total gross deferred tax liabilities		(56	)		(52	)
Net deferred tax assets	$	—		$	—

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Year Ended June 30,
(In thousands)	2022		2021
Fiscal year beginning balance	$	329	$	—
Additions for tax positions of current period		71		80
Additions for tax positions of prior years		—		249
Decreases for tax positions of prior years		—		—
Fiscal year ending balance	$	400	$	329