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Note 8 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Net operating loss and tax credit carryforwards | $ 29,545 | $ 24,239
Joint venture and other investments | (27) | (27)
Accrued retirement benefits | 3,010 | 3,055
Property net book value | 3,300 | 2,266
Deferred revenue | 697 | 666
Stock compensation |  | 16
Reserves and other | (10) | 189
Total deferred tax assets | 36,515 | 30,404
Valuation allowance | (36,515) | (30,404)
Net deferred tax assets |  |

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