Note 4 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued professional fees	$ 587	$ 388
Accrued bonuses	513	613
Customer advance payments	442	20
Accrued payroll and other related expenses	251	113
Accrued clinical trial costs	4	112
Other accruals	181	47
Total accrued liabilities	$ 1,978	$ 1,293