Note 10 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2019
Retained Earnings (Accumulated Deficit), Ending Balance	$ 1,965,957	$ 1,432,565
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 42,024
Operating Lease, Liability, Total			42,056
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance			$ 0
Maximum [Member]
Lessee, Operating Lease and Finance Lease, Remaining Term of Contract (Year)	20 years
Lessee, Operating Lease, Renewal Term (Year)	10 years