Note 7 - Accounts Payable, Accrued Expenses and Other Liabilities - Summary of Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts payable, trade	$ 10,741	$ 19,330
Accrued compensation and other	26,448	24,072
Accrued operating expenses	19,498	18,498
Total accounts payable, accrued expenses and other liabilities	$ 56,687	$ 61,900