Note 7 - Leases - Lease Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 19,750	$ 22,235
Short-term lease cost	24,607	25,382
Total lease cost	44,357	47,617
Operating cash flows from operating leases	19,083	22,144
Operating leases	$ 7,708	$ 18,879