| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K/A | 10-K/A | 10-K | 10-K | 10-K/A | 10-K | 10-K | 10-K |
| Revenues: |
| Antimony | | | 5.5 | 6.1 | 7.6 | 8.7 | 9.9 | 8.6 |
| Zeolite | 2.6 | 2.1 | 2.6 | 2.7 | 2.3 | 2.5 | 2.8 | |
| Precious metals | 0.3 | 0.2 | 0.2 | 0.3 | 0.4 | 0.7 | 0.5 | |
| Other | 4.8 | 2.9 | | | | | 0.0 | 2.2 |
| Total revenues | 7.7 | 5.2 | 8.3 | 9.0 | 10.2 | 11.9 | 13.1 | 10.8 |
| Revenue growth [+] | 48.0% | -36.7% | -8.5% | -11.7% | -14.0% | -9.3% | 21.7% | -2.3% |
| Antimony | | | -10.8% | -19.4% | -13.2% | -11.3% | 14.9% | -2.3% |
| Zeolite | 22.4% | -19.2% | -1.6% | 17.7% | -8.3% | -10.2% | | |
| Precious metals | 94.4% | -10.4% | -23.7% | -32.1% | -44.3% | 36.9% | | |
| Antimony Division - United States | 63.6% | | | | | | | |
| Cost of goods sold | 6.9 | 5.0 | 9.1 | 9.4 | 10.3 | 11.8 | 14.0 | 11.5 |
| Gross profit | 0.8 | 0.2 | -0.8 | -0.4 | -0.1 | 0.1 | -0.8 | -0.8 |
| Gross margin | 10.8% | 3.9% | -9.9% | -4.1% | -0.9% | 0.4% | -6.5% | -7.0% |
| Selling, general and administrative [+] | 1.2 | 1.2 | 1.4 | 1.2 | 0.9 | 1.0 | 1.0 | 0.8 |
| General and administrative [+] | 1.2 | 1.2 | 1.4 | 1.2 | 0.9 | 1.0 | 1.0 | 0.8 |
| General and administrative expenses | 0.7 | 0.6 | 0.7 | 0.8 | 0.6 | 0.7 | 0.7 | 0.6 |
| Professional fees | 0.3 | 0.2 | 0.2 | 0.4 | 0.2 | 0.3 | 0.3 | 0.2 |
| Other selling, general and administrative | | | | | | | | |
| Other operating expenses | 0.2 | 2.0 | 0.1 | -1.4 | | -0.1 | -1.1 | 0.0 |
| EBITDA [+] | 0.3 | -2.1 | -1.4 | 0.8 | 0.0 | 0.2 | 0.1 | -0.8 |
| EBITDA growth | -114.0% | 45.2% | -292.4% | 8082.4% | -95.0% | 42.0% | -116.7% | 18.9% |
| EBITDA margin | 3.8% | -40.1% | -17.5% | 8.3% | 0.1% | 1.5% | 1.0% | -7.2% |
| Depreciation and amortization | 0.9 | 0.9 | 0.9 | 0.9 | 1.0 | 1.0 | 0.9 | 0.8 |
| EBIT [+] | -0.6 | -3.0 | -2.3 | -0.2 | -1.0 | -0.8 | -0.8 | -1.6 |
| EBIT growth | -80.4% | 27.5% | 1431.7% | -84.1% | 17.5% | 1.6% | -48.2% | 16.0% |
| EBIT margin | -7.6% | -57.0% | -28.3% | -1.7% | -9.4% | -6.9% | -6.1% | -14.4% |
| Non-recurring items [+] | 0.1 | 0.3 | 1.4 | -0.7 | | | 0.0 | 0.0 |
| Loss (gain) on sale of assets | 0.1 | 0.3 | 1.4 | -0.7 | | | 0.0 | 0.0 |
| Interest expense, net [+] | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.2 | 0.0 | 0.0 |
| Interest expense | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.2 | | 0.0 |
| Interest income | | | | | 0.0 | 0.0 | 0.0 | 0.0 |
| Other income (expense), net [+] | 0.6 | 0.0 | 0.2 | 0.1 | -0.1 | 0.0 | 0.0 | 0.0 |
| Gain (loss) on foreign currency transactions | | | | | 0.0 | | | |
| Pre-tax income | -0.1 | -3.3 | -3.7 | 0.5 | -1.1 | -1.0 | -0.8 | -1.6 |
| Income taxes | 0.0 | 0.0 | 0.0 | -0.3 | 0.0 | 0.3 | 0.0 | 0.0 |
| Tax rate | 0.0% | 0.0% | 0.0% | | 0.0% | | 0.0% | 0.0% |
| Net income | -0.1 | -3.3 | -3.7 | 0.8 | -1.2 | -1.4 | -0.9 | -1.6 |
| Net margin | -1.4% | -63.7% | -45.0% | 9.1% | -11.6% | -11.4% | -6.8% | -15.3% |
| |
| Basic EPS [+] | $0.00 | ($0.05) | ($0.05) | $0.01 | ($0.02) | ($0.02) | ($0.01) | ($0.03) |
| Growth | -98.0% | -7.3% | -544.6% | -169.1% | -13.7% | 51.7% | -47.3% | -6.2% |
| Diluted EPS [+] | $0.00 | ($0.05) | ($0.05) | $0.01 | ($0.02) | ($0.02) | ($0.01) | ($0.03) |
| Growth | -98.0% | -7.3% | -545.4% | -169.0% | -13.7% | 51.7% | -47.3% | -6.2% |
| |
| Shares outstanding (basic) [+] | 106.1 | 66.7 | 69.0 | 68.0 | 67.4 | 66.8 | 66.2 | 64.6 |
| Growth | 59.1% | -3.3% | 1.5% | 0.8% | 0.9% | 0.9% | 2.5% | 3.7% |
| Shares outstanding (diluted) [+] | 106.1 | 66.7 | 69.0 | 68.1 | 67.4 | 66.8 | 66.2 | 64.6 |
| Growth | 59.1% | -3.3% | 1.3% | 1.0% | 0.9% | 0.9% | 2.5% | 3.7% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |