Note 5 - Note Payable (Details) - Summary of Note Payable - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	[1]
Summary of Note Payable [Abstract]
2015 (remaining 6 months)	$ 268
2016	1,662
2017	1,681
2018	745
Total payments	4,356
Less: Amount representing interest	(356)
Present value of obligations	4,000
Less: Notes payable, current portion	4,000	$ 2,500
Note payable, noncurrent portion	$ 0

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