Note 10 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Year 1, operating leases	$ 7,433
Year 1, financing leases	320
Year 2, operating leases	7,410
Year 2, financing leases	329
Year 3, operating leases	7,357
Year 3, financing leases	338
Year 4, operating leases	7,116
Year 4, financing leases	348
Year 5, operating leases	6,929
Year 5, financing leases	357
2024 and thereafter, operating leases	157,626
2024 and thereafter, financing leases	3,383
Total lease payments, operating leases	193,871
Total lease payments, financing leases	5,075
Less imputed interest, operating leases	(113,749)
Less imputed interest, financing leases	(2,358)
Total present value of lease obligations, financing leases	2,717	$ 2,729
Present value of current obligations, financing leases	(56)
Present value of long-term obligations, financing leases	2,661
Operating Lease, Liability, Current and Noncurrent, Gross [Member]
Total present value of lease obligations, operating leases	80,122
Operating Lease, Liability, Current, Gross [Member]
Present value of current obligations, operating leases	(1,915)
Operating Lease, Liability, Noncurrent, Gross [Member]
Present value of long-term obligations, operating leases	$ 78,207