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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract]    
Excess tax basis over book basis of property, plant, and equipment $ 7,225 $ 7,225
Marketable securities 0 103
Operating loss carryforwards 39,709 40,620
Capital loss carryforwards 14,394 14,065
Capital expenditures 374 374
Stock compensation 55 179
VAT recoverable 152 145
Unrealized foreign exchange gain/loss 0 116
Environmental liability 0 65
Offering costs 229 305
Accrued vacation 29 26
Other 0 4
Total future tax assets 62,167 63,227
Valuation allowance for future tax assets (62,167) (63,227)
Total income tax assets 0 0
Other investments 0 0
Total deferred income tax liabilities 0 0
Total Deferred Taxes $ 0 $ 0