Note 7 - Accounts Payable, Accrued Expenses and Other Liabilities - Summary of Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts payable, trade	$ 12,394	$ 19,330
Accrued compensation and other	42,833	24,072
Accrued operating expenses	19,675	18,498
Total accounts payable, accrued expenses and other liabilities	$ 74,902	$ 61,900