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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accrued employee benefit plan costs | $ 8,726 | $ 7,275
Stock based compensation | 991 | 649
Net operating loss and tax credit carryforwards | 448,624 | 215,797
Restructuring fees not currently deductible for tax purposes | 0 | 566
Disallowed business interest expense carryforward | 10,935 | 10,386
Capital loss carryforward | 2,027 | 0
Other | 2,656 | 3,152
Gross deferred tax assets | 473,959 | 237,825
Less valuation allowance | (441,893) | (204,899)
Net deferred tax assets | 32,066 | 32,926
Depreciation and amortization | (30,959) | (31,745)
Outside basis difference deferred tax liability | (2,891) | (2,891)
Foreign interest withholding tax | (1,072) | (990)
Other | 692 | 572
Gross deferred tax liabilities | (34,230) | (35,054)
Net deferred tax assets (liabilities) | $ (2,164) | $ (2,128)

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