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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Components of Deferred Tax Assets and Liabilities [Abstract]    
Excess tax basis over book basis of property, plant, and equipment $ 7,225 $ 7,776
Marketable securities 103 0
Operating loss carryforwards 40,620 36,965
Capital loss carryforwards 14,065 13,778
Capital expenditures 374 374
Stock compensation 179 164
VAT recoverable 145 150
Unrealized foreign exchange gain/loss 116 117
Environmental liability 65 65
Offering costs 305 46
Accrued vacation 26 22
Other 4 5
Total future tax assets 63,227 59,462
Valuation allowance for future tax assets (63,227) (59,401)
Total income tax assets 0 61
Other investments 0 61
Total deferred income tax liabilities 0 61
Total Deferred Taxes $ 0 $ 0