Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net operating loss carryforward	$ 9,495	$ 7,381
Stock-based compensation	1,110	664
Accruals and reserves	192	181
Inventory	88	42
Lease liabilities	208	101
Tax credit carryforward	152
Other	4
Total deferred tax assets	11,249	8,369
Intangibles	(2,217)
Right-of-use assets	(218)
Fixed assets	(108)	(24)
Total deferred tax liabilities	(2,543)	(24)
Total deferred taxes	8,706	8,345
Less: valuation allowance	(8,706)	(8,345)
Net deferred taxes