Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Reserves and accruals	$ 1,040	$ 476
Amortization	(12)	(11)
Capital losses and other	11	1
Non-qualified stock option expense	182	165
Loss Carryforwards	6,897	5,901
Total deferred tax assets	8,118	6,532
Valuation allowance	(4,951)	(3,081)
Net deferred tax assets	3,167	3,451
Depreciation	(3,167)	(3,451)
Total deferred tax liabilities	(3,167)	(3,451)
Net deferred tax assets (liabilities)