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Note 12 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Net operating loss and tax credit carryforwards | $ 24,648 | $ 23,980
Joint venture and other investments | (446) | (27)
Accrued retirement benefits and other compensation | 1,233 | 1,149
Property net book value | 3,002 | 2,960
Deferred revenue | 962 | 1,016
Reserves and other | 37 | (50)
Total deferred tax assets | 29,436 | 29,028
Valuation allowance | (29,436) | (29,028)
Net deferred tax assets | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards and the tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards. + References No definition available. + Details
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