Note 5 - Income Taxes - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets
Allowance for doubtful accounts	$ 21	$ 21
Accrued expenses	414	129
Stock-based compensation	381	325
R&D tax credits	1,086	1,083
Operating lease	701	944
Capitalized research expenses	404	0
NOL carryforward	72	219
Gross Deferred Tax Assets	3,079	2,721
Valuation Allowance	(895)	(414)
Deferred Tax Assets After Valuation Allowance	2,184	2,307
Deferred Tax Liabilities
Excess of tax over book depreciation and amortization	(783)	(1,249)
Prepaid expenses	(78)	(61)
Operating lease	(632)	(837)
Gross Deferred Tax Liabilities	(1,493)	(2,147)
Net Deferred Tax Assets	$ 691	$ 160