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Note 5 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accrued employee benefit plan costs | $ 7,275 | $ 8,815
Stock based compensation | 649 | 407
Net operating loss and tax credit carryforwards | 215,797 | 148,699
Restructuring fees not currently deductible for tax purposes | 566 | 1,415
Disallowed business interest expense carryforward | 10,386 | 5,546
Other | 3,152 | 2,518
Gross deferred tax assets | 237,825 | 167,400
Less valuation allowance | (204,899) | (140,428)
Net deferred tax assets | 32,926 | 26,972
Depreciation and amortization | (31,745) | (25,883)
Outside basis difference deferred tax liability | (2,891) | (2,891)
Foreign interest withholding tax | (990) | (859)
Other | 572 | (754)
Gross deferred tax liabilities | (35,054) | (30,387)
Net deferred tax assets (liabilities) | $ (2,128) | $ (3,415)

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