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Note 7 - Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Net operating losses | $ 64,418 | $ 75,303
Fixed asset basis difference | 4,566 | 4,555
Contributions carryover | 38 | 32
Deferred compensation | 1,502 | 1,289
Accrued liabilities and others | 333 | 303
Total deferred tax assets | 70,857 | 81,482
Valuation allowance for deferred tax assets | (70,857) | (81,482)
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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