Note 10 - Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
2020 (excluding the nine months ended September 30, 2020), operating leases	$ 1,748
2020 (excluding the nine months ended September 30, 2020), financing leases	81
2021, operating leases	7,966
2021, financing leases	327
2022, operating leases	7,872
2022, financing leases	336
2023, operating leases	7,563
2023, financing leases	345
2024, operating leases	7,380
2024, financing leases	355
Thereafter, operating leases	163,814
Thereafter, financing leases	3,472
Total lease payments, operating leases	196,343
Total lease payments, financing leases	4,916
Less imputed interest, operating leases	(113,558)
Less imputed interest, financing leases	(2,225)
Total present value of lease obligations, financing leases	2,691	$ 2,729
Present value of current obligations, financing leases	(63)
Present value of long-term obligations, financing leases	2,628
Operating Lease, Liability, Current and Noncurrent, Gross [Member]
Total present value of lease obligations, operating leases	82,785
Operating Lease, Liability, Current, Gross [Member]
Present value of current obligations, operating leases	(2,287)
Operating Lease, Liability, Noncurrent, Gross [Member]
Present value of long-term obligations, operating leases	$ 80,498