Note 7 - Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loss contingency for litigation	$ 4,000	$ 4,000
Accrued legal and professional fees	1,003	1,123
Accrued consulting and clinical trial costs	5,487	6,933
Accrued payroll and related costs	1,015	1,957
Other	1,200	1,751
Accrued expenses	$ 12,705	$ 15,764