Note 2 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	2018		2017
Current:
Federal	$	—	$	(5,000	)
State		7,000		9,000
		7,000		4,000
Deferred - Federal		39,000		(302,000	)
	$	46,000	$	(298,000	)

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

	2018			2017
Expected provision for federal income taxes	$	39,000		$	(178,000	)
State income taxes, net of federal benefit		7,000			2,000
Non-deductible meals, entertainment, and life insurance		12,000			29,000
Research and development credit		(43,000	)		(38,000	)
Change in valuation allowance		18,000			16,000
Tax rate change adjustment related to Tax Reform Act		—			(115,000	)
Prior year true-ups and other		13,000			(14,000	)
	$	46,000		$	(298,000	)

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

	2018			2017
Deferred tax liabilities:
Accrued vacation	$	18,000		$	19,000
Inventories reserve		46,000			46,000
Allowance for doubtful accounts		2,000			2,000
Allowance for sales returns		9,000			9,000
Research and development credit carryforward		161,000			131,000
Accrued self-insured medical		4,000			1,000
Property and equipment		(282,000	)		(242,000	)
Intangible assets		(73,000	)		(65,000	)
Net operating loss		33,000			40,000
Other		8,000			6,000
Valuation allowance		(109,000	)		(91,000	)
Net deferred tax liabilities	$	(183,000	)	$	(144,000	)