Note 5 - Note Payable - Summary of Note Payable (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	[1]
2016 (remaining 9 months)	$ 1,530
2017	2,124
2018	1,161
2019	34
Total payments	4,849
Less: Amount representing interest	(315)
Present value of obligations	4,534
Less: Unamortized debt discount	(342)
	4,192
Notes Payable, Current	$ 4,192	$ 4,446

[1] The condensed consolidated balance sheet as of December 31, 2015 has been derived from the audited consolidated financial statements as of that date.