Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accrued employee benefit plan costs	$ 6,678	$ 8,726
Stock based compensation	1,838	991
Net operating loss and tax credit carryforwards	596,093	448,624
Disallowed business interest expense carryforward	14,764	10,935
Capital loss carryforward	5,607	2,027
Other	7,195	2,656
Gross deferred tax assets	632,175	473,959
Less valuation allowance	(591,720)	(441,893)
Net deferred tax assets	40,455	32,066
Depreciation and amortization	(40,294)	(30,959)
Outside basis difference deferred tax liability	(2,891)	(2,891)
Foreign interest withholding tax	(1,154)	(1,072)
Other	1,628	692
Gross deferred tax liabilities	(42,711)	(34,230)
Net deferred tax liabilities	$ (2,256)	$ (2,164)