Note 4 - Accrued Liabilities (Details) - Accrued Liabilities - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued clinical trial costs	$ 323
Accrued professional fees	242	$ 117
Accrued bonuses	169
Customer advance payments	108
Accrued vacation	95	86
Other accruals	55	20
Total accrued liabilities	$ 992	$ 223	[1]

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date.