Note 8 - Leases - Future Payments of Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Operating Lease, 2018	$ 73
Capital Leases, 2018	3,606
Operating Lease, 2019	73
Capital Leases, 2019	3,606
Operating Lease, 2020	73
Capital Leases, 2020	5,813
Operating Lease, 2021
Capital Leases, 2021	5,368
Operating Lease, 2022
Capital Leases, 2022	5,175
Operating Lease, Thereafter
Capital Leases, Thereafter	3,383
Operating Lease, Total minimum lease payments	219
Capital Leases, Total minimum lease payments	26,951
Capital Leases, Less: amount representing interest	(2,212)
Capital Leases, Present value of minimum lease payments	24,739
Capital Leases, Less: current portion	(2,962)	$ (2,441)
Capital Leases, Capital lease obligations, long-term	$ 21,777	$ 19,761