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Note 8 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Net operating loss and tax credit carryforwards | $ 38,915 | $ 47,640
Joint venture and other investments | 18 | 183
Accrued retirement benefits | 3,924 | 3,608
Property net book value | 2,801 | 3,275
Deferred revenue | 953 | 1,101
Stock compensation | 22 | 22
Reserves and other | 404 | 408
Total deferred tax assets | 47,037 | 56,237
Valuation allowance | (47,037) | (56,237)
Net deferred tax assets |  |

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