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Note 9 - Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Net operating losses | $ 75,727 | $ 69,537
Fixed asset basis difference | 4,738 | 4,599
Contributions carryover | 29 | 48
Deferred compensation | 157 | 695
Accrued liabilities and other | 796 | 358
Total deferred tax assets | 81,447 | 75,237
Valuation allowance for deferred tax assets | (81,447) | (75,237)
Net deferred tax asset | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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