Note 5 - Note Payable (Details) - Summary of Note Payable (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Summary of Note Payable [Abstract]
2015 (remaining 9 months)	$ 299
2016	1,473
2017	1,469	1,045
2018	609	337
Total payments	3,850	2,770
Less: Amount representing interest	(350)	(270)
Present value of obligations	3,500	2,500
Less: Notes payable, current portion	$ 3,500	$ 2,500	[1]	$ 1,463

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