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Note 8 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Net operating loss and tax credit carryforwards | $ 46,395 | $ 50,361
Joint venture and other investments | 183 | 238
Accrued retirement benefits | 4,765 | 2,550
Property net book value | 3,275 | 2,715
Deferred revenue | 1,101 | 1,160
Stock compensation | 22 | 154
Reserves and other | 460 | 447
Total deferred tax assets | 56,201 | 57,625
Valuation allowance | $ (56,201) | $ (57,625)
Net deferred tax assets |  |

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