Note 7 - Long-term Debt - Long-term Debt Interest Expense (Details) - Deerfield Loan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Amortization of prepaid interest expense	$ 273	$ 544	$ 543	$ 1,088
Cash interest expense	257		511
Total interest expense	$ 530	$ 544	$ 1,054	$ 1,088