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Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued employee benefit plan costs | $ 8,815 | $ 7,422
Stock based compensation | 407 | 972
Net operating loss and tax credit carryforwards | 148,699 | 99,281
Restructuring fees not currently deductible for tax purposes | 1,415 | 2,264
Disallowed business interest expense carryforward | 5,546 | 5,105
Other | 2,518 | 3,380
Gross deferred tax assets | 167,400 | 118,424
Less valuation allowance | (140,428) | (103,496)
Net deferred tax assets | 26,972 | 14,928
Depreciation and amortization | (25,883) | (11,246)
Outside basis difference deferred tax liability | (2,891) | (2,892)
Foreign interest withholding tax | (859) | 0
Other | (754) | (2,981)
Gross deferred tax liabilities | (30,387) | (17,119)
Net deferred tax assets (liabilities) | $ (3,415) | $ (2,191)

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