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Income Taxes - Deferred Tax Assets/Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Components of Deferred Tax Assets and Liabilities [Abstract]    
Excess tax basis over book basis of property, plant, and equipment $ 7,776 $ 8,295
Marketable securities 0 500
Operating loss carryforwards 36,965 36,716
Capital loss carryforwards 13,778 13,618
Capital expenditures 374 374
Stock compensation 164 235
VAT recoverable 150 158
Unrealized foreign exchange gain/loss 117 125
Environmental liability 65 65
Offering costs 46 104
Accrued vacation 22 24
Other 5 0
Total future tax assets 59,462 60,214
Valuation allowance for future tax assets (59,401) (59,886)
Total income tax assets 61 328
Other investments 61 328
Total deferred income tax liabilities 61 328
Total Deferred Taxes $ 0 $ 0