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Note 8 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Net operating loss and tax credit carryforwards | $ 25,745 | $ 38,915
Joint venture and other investments | (22) | 18
Accrued retirement benefits | 2,483 | 3,924
Property net book value | 1,716 | 2,801
Deferred revenue | 546 | 953
Stock compensation | 13 | 22
Reserves and other | (115) | 404
Total deferred tax assets | 30,366 | 47,037
Valuation allowance | (30,366) | (47,037)
Net deferred tax assets |  |

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