| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenues: | | | | | | | | |
| Sales | 104.9 | 92.1 | | | 81.3 | 72.2 | | |
| Real estate development and property management fees | 2.6 | 1.6 | | | | | | |
| Interest income | 1.7 | 2.5 | 2.0 | 1.6 | 1.2 | 1.1 | 1.6 | 1.5 |
| Net gains on sales of real estate assets | | | | | | 1.3 | | |
| Other revenue | 0.7 | 2.2 | | | 0.1 | 1.0 | | |
| Total revenues | 106.8 | 95.0 | 115.8 | 72.7 | 83.7 | 75.5 | 105.9 | 89.3 |
| Total revenues growth | 27.7% | 25.9% | 9.3% | -18.6% | 42.0% | 27.0% | 88.3% | 111.6% |
| Costs and expenses: | | | | | | | | |
| Cost of sales | | | | | | | | |
| Interest expense | -0.7 | -0.7 | | | -0.5 | -0.5 | | |
| |
| Recoveries from loan losses, net | | | | | | | | |
| Impairment losses | | | | | | 0.1 | | |
| Selling, general and administrative expenses | 34.3 | 33.8 | | | 30.1 | 27.4 | | |
| Total costs and expenses | 116.5 | 106.1 | 87.9 | 84.3 | 86.8 | 80.6 | 92.2 | 78.3 |
| Operating losses | -9.7 | -11.1 | 27.9 | -11.6 | -3.1 | -5.1 | 13.7 | 11.0 |
| Operating margin | -9.1% | -11.7% | 24.1% | -16.0% | -3.7% | -6.7% | 12.9% | 12.4% |
| Equity in net earnings of unconsolidated real estate joint ventures | 0.7 | 1.1 | | | 19.2 | 1.5 | | |
| |
| Gain on consolidation | | | | | | | | |
| Other income (loss) | 0.7 | 2.2 | | | 0.1 | 1.0 | | |
| Foreign exchange loss | -0.5 | 0.0 | | | 0.4 | -0.2 | | |
| (Loss) income before income taxes | -8.7 | 9.2 | 22.5 | 6.5 | 16.6 | -2.8 | 8.3 | 25.7 |
| Benefit (provision) for income taxes | 1.3 | -1.7 | -7.3 | -2.5 | -6.2 | 0.8 | -3.2 | -6.4 |
| Net (loss) income | -7.4 | 7.5 | | | 10.4 | -1.9 | | |
| Net (income) loss attributable to noncontrolling interests | -0.6 | 0.4 | 0.4 | | 0.1 | 0.1 | | |
| Net (loss) income attributable to shareholders | -8.0 | 7.9 | 15.4 | 4.0 | 10.5 | -1.8 | 5.3 | 19.2 |
| |
| Basic (loss) earnings per share (in dollars per share) | ($0.56) | $0.55 | $0.99 | $0.26 | $0.68 | ($0.12) | $0.36 | $1.13 |
| Diluted (loss) earnings per share (in dollars per share) | ($0.56) | $0.55 | | | $0.68 | ($0.12) | | |
| |
| Basic weighted average number of common shares outstanding (in shares) | 14.4 | 14.4 | 15.5 | 15.4 | 15.5 | 15.5 | 17.8 | 17.0 |
| Diluted weighted average number of common shares outstanding (in shares) | 14.4 | 14.4 | | | 15.5 | 15.5 | | |
| Net (loss) income | -7.4 | 7.5 | | | 10.4 | -1.9 | | |
| |
| Other comprehensive income (loss), net of tax: | | | | | | | | |
| Unrealized (loss) gain on securities available for sale | 0.0 | | | | 0.0 | | | |
| Foreign currency translation adjustments | 0.4 | 0.0 | 0.1 | -0.8 | -0.4 | 0.2 | 0.0 | -0.3 |
| |
| Other comprehensive income (loss), net | | | | | | | | |
| Comprehensive (loss) income, net of tax | | | | | | | | |
| Comprehensive (income) loss attributable to noncontrolling interests | | | | | | | | |
| Comprehensive (loss) income attributable to shareholders | -7.7 | 7.9 | | | 10.0 | -1.7 | | |