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Note 7 - Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Net operating losses | $ 75,303 | $ 70,202
Fixed asset basis difference | 4,555 | 4,547
Contributions carryover | 32 | 30
Deferred compensation | 1,289 | 1,098
Accrued liabilities and others | 303 | 271
Total deferred tax assets | 81,482 | 76,148
Valuation allowance for deferred tax assets | (81,482) | (76,148)
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=84230637&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=84230637&loc=d3e32621-109319 + Details
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