Note 5 - Accounts Payable, Accrued Expenses and Other Liabilities - Summary of Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts payable, trade	$ 12,325	$ 12,394
Accrued compensation and other	16,236	42,833
Accrued operating expenses	28,164	19,675
Current portion of lease liabilities	6,353
Total accounts payable, accrued expenses and other liabilities	$ 63,078	$ 74,902