Note 5 - Long-term Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
2017, operating leases	$ 34,200
2017, capital leases	5,200
2018, operating leases	34,200
2018, capital leases	5,200
2019, operating leases	34,200
2019, capital leases	5,200
2020, operating leases	34,200
2020, capital leases	5,200
2021, operating leases	34,200
2021, capital leases	5,200
Thereafter, operating leases	176,750
Thereafter, capital leases	11,267
Total minimum lease payments, operating leases	347,750
Total minimum lease payments, capital leases	37,267
Less: Amounts representing interest, capital leases	(7,038)
Present value of minimum lease payments, capital leases	30,229
Less: Current portion, capital leases	(3,481)	$ (3,279)
Long-term capital lease obligations, capital leases	$ 26,748	$ 30,228