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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)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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