Note 5 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Employee related expenses	$ 4,531	$ 3,348
Royalties	2,177	$ 2,458
Clinical trials	261
Professional services	212	$ 323
Inventory	86	88
Rent	55	196
Other accrued liabilities	564	657
Total accrued liabilities	$ 7,886	$ 7,070