Note 11 - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cost, Depreciation, Amortization and Depletion, Total			$ 67,100	$ 62,700	$ 63,700
Operating Lease, Right-of-Use Asset		$ 49,312	49,312	52,987
Gain (Loss) on Disposition of Assets, Total		19,800	33,781	4,925	$ 13,373
Asset Retirement Obligation, Current, Ending Balance		1,700	1,700	6,000
Asset Retirement Obligations, Noncurrent, Total		23,300	23,300	17,900
Asset Retirement Obligation, Liabilities Expected to Be Settled by 2027			8,200
Operating Lease, Liability, Noncurrent		32,928	32,928	$ 39,816
Sale-leaseback Associated with Two Properties in California [Member]
Sale Leaseback Transaction, Net Book Value, Total	$ 11,100	3,100	3,100
Operating Lease, Right-of-Use Asset	2,400	1,400	1,400
Gain (Loss) on Disposition of Assets, Total	$ 29,700
Operating Lease, Liability, Noncurrent		$ 1,400	$ 1,400