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Note 7 - Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Net operating losses | $ 70,202 | $ 65,852
Fixed asset basis difference | 4,547 | 4,551
Contributions carryover | 30 | 32
Deferred compensation | 1,098 | 1,073
Accrued liabilities | 271 | 492
Total deferred tax assets | 76,148 | 72,000
Valuation allowance for deferred tax assets | (76,148) | (72,000)
Net deferred tax asset |  |

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