Note 10 - Leasing Activities - Future Minimum Lease Payments Under Capital and Non-cancelable Vehicle Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
2017	$ 17,029
2017	819
2018	17,657
2018	672
2019	18,264
2019	602
2020	16,977
2020	342
2021	10,936
2021	342
Thereafter	11,659
Thereafter	190
Total minimum lease payments	92,522
Total minimum lease payments	2,967
Less amount representing interest	(8,029)
Present value of net minimum capital lease payments	84,493
Less current portion	(14,449)	$ (14,691)
Obligations under capital leases less current portion	$ 70,044	$ 69,074