Note 5 - Balance Sheet Details - Summary of Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued warranty	$ 283	$ 236
Deferred rent	29	37
Other accrued liabilities	378	359
Accrued Service Contracts [Member]
Accrued professional fees	41	28
Accrued Contingent Legal Fees [Member]
Accrued professional fees	21	25
Other Accrued Liabilities [Member]
Other accrued liabilities	$ 4	$ 33