Note 5 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets (liabilities)
Net operating loss carryforwards	$ 7,381	$ 8,162
Accrued compensation	181	32
Depreciation	(24)
Depreciation		43
Section 263a inventory adjustment	42	29
Stock-based compensation	664	688
Deferred rent	101
Outside basis difference in SAVSU
Outside basis difference in SAVSU		(225)
Other		28
Total	8,345	8,757
Less: Valuation allowance	(8,345)	(8,757)
Net deferred tax asset