Note 2 - Balance Sheet Details - Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued warranty	$ 290	$ 365
Accrued commissions	55	41
Accrued professional fees		100
Accrued deferred rent		22
Other accrued liabilities	23	31
Total other accrued liabilities	$ 368	$ 559