| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues: |
| Refined Coal | | | 44.4 | 86.1 | 69.3 | 63.5 | 51.7 | 19.6 |
| Emissions Control | | | | | | | 50.6 | 62.7 |
| Other | | | 22.9 | | | | | |
| Total revenues [+] | 103.0 | 100.3 | 67.4 | 70.1 | 23.9 | 45.4 | 50.6 | 62.7 |
| Services | | | | | | | 3.0 | 0.9 |
| Other | | | | | | | 0.6 | 1.8 |
| Revenue growth [+] | 2.7% | 48.9% | -3.9% | 192.7% | -47.2% | -10.4% | -19.3% | 270.7% |
| Refined Coal | | | -48.4% | 24.1% | 9.2% | 22.8% | 163.6% | -60.6% |
| Emissions Control | | | | | | | -19.2% | 285.6% |
| Cost of goods sold [+] | 10.5 | 11.3 | 10.6 | 10.1 | 10.6 | 8.5 | 54.4 | 74.5 |
| Cost of services | | | | | | | 1.7 | 0.6 |
| Labor costs | | | | | | 7.7 | 12.4 | 23.6 |
| Lease costs | | | | | | 0.8 | 2.2 | 3.3 |
| Contract costs | | | | | | | 0.4 | 1.5 |
| Coal costs | | | | | | | 37.7 | 45.4 |
| Gross profit | 92.4 | 89.0 | 56.7 | 60.0 | 13.3 | 36.9 | -3.8 | -11.7 |
| Gross margin | 89.8% | 88.7% | 84.2% | 85.6% | 55.6% | 81.3% | -7.4% | -18.7% |
| Selling, general and administrative [+] | 17.6 | 13.3 | 13.8 | 18.1 | 12.7 | 8.4 | 12.0 | 22.7 |
| General and administrative [+] | 17.6 | 13.3 | 13.8 | 18.1 | 12.7 | 8.4 | 12.0 | 22.7 |
| General and administrative expenses | 8.1 | 7.1 | 8.2 | 8.1 | 4.2 | 4.0 | 3.7 | 6.1 |
| Professional fees | 9.5 | 6.3 | 5.6 | 9.9 | 8.6 | 4.4 | 8.3 | 16.6 |
| Other selling, general and administrative | | | | | | | | |
| Research and development | | | | | | | -0.6 | 5.4 |
| Equity in earnings | 3.5 | 68.7 | 31.0 | 69.2 | 54.2 | 53.8 | 45.6 | 8.9 |
| Other operating expenses | 80.5 | 62.9 | 50.4 | 49.4 | 6.3 | 31.9 | | |
| EBITDA [+] | -2.1 | 81.5 | 23.5 | 61.7 | 48.5 | 50.5 | 30.5 | -30.9 |
| EBITDA growth | -102.6% | 246.7% | -61.9% | 27.0% | -3.9% | 65.7% | -198.7% | -1216.9% |
| EBITDA margin | -2.0% | 81.3% | 34.9% | 88.0% | 202.7% | 111.3% | 60.2% | -49.2% |
| Depreciation | 5.9 | 7.0 | 7.5 | 6.4 | 0.5 | 0.7 | 0.9 | 1.6 |
| EBITA | -8.0 | 74.5 | 16.0 | 55.3 | 48.0 | 49.8 | 29.6 | -32.5 |
| EBITA margin | -7.8% | 74.3% | 23.7% | 78.9% | 200.5% | 109.8% | 58.4% | -51.8% |
| Amortization of intangibles | 0.5 | 0.9 | 1.0 | 1.0 | 0.2 | 0.1 | 0.1 | 0.4 |
| EBIT [+] | -8.5 | 73.6 | 15.0 | 54.3 | 47.8 | 49.7 | 29.5 | -32.9 |
| EBIT growth | -111.6% | 391.5% | -72.4% | 13.5% | -3.8% | 68.6% | -189.7% | -3761.4% |
| EBIT margin | -8.3% | 73.4% | 22.2% | 77.5% | 199.7% | 109.6% | 58.2% | -52.4% |
| Non-recurring items | | | 25.0 | | | | | |
| Interest expense, net [+] | 0.3 | 1.5 | 3.9 | 7.2 | 2.2 | 3.0 | 4.8 | 8.4 |
| Interest expense | 0.3 | 1.5 | 3.9 | 7.2 | 2.2 | 3.0 | 5.1 | 8.4 |
| Interest income | | | | | | 0.1 | 0.3 | 0.0 |
| Other income (expense), net [+] | 0.2 | 4.0 | 0.1 | 0.4 | 0.2 | 5.3 | 12.1 | 11.1 |
| Royalty income | | | | | | | 6.1 | 10.6 |
| Gain (loss) on debt retirement | | 3.3 | | | | | | |
| Other | 0.2 | 0.6 | 0.1 | 0.4 | 0.2 | 2.0 | 8.6 | 11.1 |
| Pre-tax income | -8.7 | 76.1 | -13.8 | 47.5 | 45.9 | 52.0 | 36.7 | -30.1 |
| Income taxes | 0.2 | 15.7 | 6.5 | 12.0 | 10.4 | 24.2 | -60.9 | 0.0 |
| Tax rate | | 20.6% | | 25.2% | 22.7% | 46.4% | | |
| Net income | -8.9 | 60.4 | -20.3 | 35.5 | 35.5 | 27.9 | 97.7 | -30.1 |
| Net margin | -8.7% | 60.2% | -30.1% | 50.7% | 148.1% | 61.4% | 193.0% | -48.0% |
| |
| Basic EPS [+] | ($0.48) | $3.31 | ($1.13) | $1.96 | $1.78 | $1.30 | $4.45 | ($1.38) |
| Growth | -114.6% | -394.0% | -157.5% | 9.9% | 36.6% | -70.7% | -421.7% | -2251.2% |
| Diluted EPS [+] | ($0.48) | $3.27 | ($1.13) | $1.93 | $1.77 | $1.30 | $4.39 | ($1.38) |
| Growth | -114.8% | -390.8% | -158.2% | 9.3% | 36.0% | -70.4% | -417.4% | -2303.6% |
| |
| Dividends per share [+] | $0.00 | $0.01 | $0.28 | $1.00 | $1.00 | $0.75 | | |
| Growth | -52.1% | -98.2% | -72.4% | 0.0% | 33.3% | | | |
| |
| Shares outstanding (basic) [+] | 18.5 | 18.3 | 18.0 | 18.2 | 19.9 | 21.4 | 21.9 | 21.8 |
| Growth | 1.1% | 1.2% | -0.6% | -8.8% | -6.9% | -2.6% | 0.7% | 1.0% |
| Shares outstanding (diluted) [+] | 18.5 | 18.5 | 18.0 | 18.4 | 20.0 | 21.4 | 22.2 | 21.8 |
| Growth | 0.0% | 2.3% | -1.8% | -8.3% | -6.4% | -3.7% | 2.1% | -1.4% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |