Note 10 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Year 1, operating leases	$ 14,733
Year 1, financing leases	322
Year 2, operating leases	7,622
Year 2, financing leases	331
Year 3, operating leases	7,492
Year 3, financing leases	340
Year 4, operating leases	7,172
Year 4, financing leases	350
Year 5, operating leases	7,148
Year 5, financing leases	360
Thereafter, operating leases	157,105
Thereafter, financing leases	3,293
Total lease payments, operating leases	201,272
Total lease payments, financing leases	4,996
Less imputed interest, operating leases	(113,159)
Less imputed interest, financing leases	(2,291)
Total present value of lease obligations, financing leases	2,705	$ 2,729
Present value of current obligations, financing leases	(59)
Present value of long-term obligations, financing leases	2,646
Operating Lease, Liability, Current and Noncurrent, Gross [Member]
Total present value of lease obligations, operating leases	88,113
Operating Lease, Liability, Current, Gross [Member]
Present value of current obligations, operating leases	(8,996)
Operating Lease, Liability, Noncurrent, Gross [Member]
Present value of long-term obligations, operating leases	$ 79,117