Note 2 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	2020			2019
Current:
Federal	$	(216,000	)	$	—
State		6,000			11,000
		(210,000	)		11,000
Deferred - Federal		—			(183,000	)
	$	(210,000	)	$	(172,000	)

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

	2020			2019
Expected provision for federal income taxes	$	(136,000	)	$	(207,000	)
State income taxes, net of federal benefit		(24,000	)		(7,000	)
Permanent items		(249,000	)		11,000
Research and development credit		(23,000	)		(29,000	)
Change in valuation allowance		440,000			51,000
Change in tax law allowing NOL carryback claim		(217,000	)		—
Prior year true-ups and other		(1,000	)		9,000
	$	(210,000	)	$	(172,000	)

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

	2020			2019
Deferred tax liabilities:
Accrued vacation	$	33,000		$	21,000
Inventories reserve		17,000			42,000
Allowance for doubtful accounts		2,000			3,000
Allowance for sales returns		10,000			10,000
Research and development credit carryforward		285,000			245,000
Accrued self-insured medical		—			3,000
Property and equipment		(257,000	)		(295,000	)
Patents		(50,000	)		(53,000	)
Net operating loss		411,000			230,000
Other		17,000			8,000
Valuation allowance		(468,000	)		(214,000	)
Net deferred tax liabilities	$	—		$	—