Note 10 - Leases - Minimum Lease Payments Under Non-cancelable Leases (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Total lease payments	$ 75,160
Total lease payments	65,688
Less: Imputed interest	(6,046)
Present value of lease liabilities	69,114
Vehicle Leases as Lessee 1 [Member]
2019, Capital Leases	22,033
2019, Operating Leases	12,295
2020, Capital Leases	19,113
2020, Operating Leases	10,466
2021, Capital Leases	14,894
2021, Operating Leases	8,190
2022, Capital Leases	11,062
2022, Operating Leases	7,078
2023, Capital Leases	5,095
2023, Operating Leases	5,196
Thereafter, Capital Leases	2,963
Thereafter, Operating Leases	$ 22,463