Note 13 - Commitments and Contingencies - Lease Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating lease cost	$ 8,798	$ 9,332
Short-term lease cost	13	140
Total lease cost	8,811	9,472
Operating cash flows from operating leases	(9,595)	(10,615)
Operating Lease, Right-of-Use Asset	$ 32,985	$ 37,866
Operating Lease, Weighted Average Remaining Lease Term	9 years 3 months 18 days	10 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	6.72%	6.80%
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 8,330
Lessee, Operating Lease, Liability, Payments, Due Year Two	10,040
Lessee, Operating Lease, Liability, Payments, Due Year Three	10,170
Lessee, Operating Lease, Liability, Payments, Due Year Four	9,904
Lessee, Operating Lease, Liability, Payments, Due Year Five	7,976
Lessee, Operating Lease, Liability, Payments, Due after Year Five	39,870
Lessee, Operating Lease, Liability, Payments, Due	86,290
Lessee, Operating Lease, Imputed Interest	(32,891)
Operating Leases, Rent Expense			$ 9,700
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	0	$ 0
Other Liabilities
Operating Lease, Liability	$ 53,399	$ 59,452
Minimum
Lessee, Operating Lease, Discount Rate	4.22%
Maximum
Lessee, Operating Lease, Discount Rate	7.08%