Note 5 - Balance Sheet Details - Summary of Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued warranty	$ 244	$ 236
Deferred rent	31	37
Other accrued liabilities	330	359
Accrued Service Contracts [Member]
Accrued professional fees	31	28
Accrued Contingent Legal Fees [Member]
Accrued professional fees	21	25
Other Accrued Liabilities [Member]
Other accrued liabilities	$ 3	$ 33