Note 10 - Leases - Maturities of Lease liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
2020, finance leases	$ 3,769
2020, operating leases	9,086
2021, finance leases	3,352
2021, operating leases	7,029
2022, finance leases	3,536
2022, operating leases	5,472
2023, finance leases	2,659
2023, operating leases	4,629
2024	2,650
2024	4,288
After 2023, finance leases	29,371
After 2023, operating leases	14,232
Total minimum lease payments, finance leases	45,337
Total minimum lease payments, operating leases	44,736
Interest component	(19,375)
Interest component	(7,727)
Present value of minimum lease payments, finance leases	25,962	$ 20,171
Other Accrued Liabilities and Operating Lease and Other Long-term Liabilities [Member]
Operating Lease, Liability, Total	$ 37,009