Note 7 - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-term debt, current portion	$ 12,500
Long-term debt, non-current portion	12,500	25,000
Deerfield Loan [Member]
Long-term debt, current portion	12,500
Long-term debt, non-current portion	12,500	25,000
Total Deerfield Loan	$ 25,000	$ 25,000