| Summary of Segment Information | The following tables summarize segment information for the three and six months ended March 31, 2021 and 2020:   
|   |   | For the Three Months Ended March 31, |   |   | For the Six Months Ended March 31, |   |  
|   |   | 2021 |   |   | 2020 |   |   | 2021 |   |   | 2020 |   |  
| Revenues |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 24,003 |   |   | $ | 18,986 |   |   | $ | 46,373 |   |   | $ | 40,474 |   |  
| Flooring Manufacturing |   |   | 32,972 |   |   |   | 27,301 |   |   |   | 63,194 |   |   |   | 47,668 |   |  
| Steel Manufacturing |   |   | 13,793 |   |   |   | — |   |   |   | 23,528 |   |   |   | — |   |  
| Corporate & other |   |   | 122 |   |   |   | 144 |   |   |   | 249 |   |   |   | 290 |   |  
|   |   | $ | 70,890 |   |   | $ | 46,431 |   |   | $ | 133,344 |   |   | $ | 88,432 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Gross profit |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 12,970 |   |   | $ | 10,330 |   |   | $ | 25,017 |   |   | $ | 21,455 |   |  
| Flooring Manufacturing |   |   | 10,022 |   |   |   | 7,313 |   |   |   | 18,347 |   |   |   | 12,676 |   |  
| Steel Manufacturing |   |   | 3,380 |   |   |   | — |   |   |   | 5,156 |   |   |   | — |   |  
| Corporate & other |   |   | 118 |   |   |   | 133 |   |   |   | 239 |   |   |   | 271 |   |  
|   |   | $ | 26,490 |   |   | $ | 17,776 |   |   | $ | 48,759 |   |   | $ | 34,402 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Operating income (loss) |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 5,071 |   |   | $ | 1,331 |   |   | $ | 9,564 |   |   | $ | 3,195 |   |  
| Flooring Manufacturing |   |   | 6,011 |   |   |   | 2,703 |   |   |   | 10,161 |   |   |   | 5,101 |   |  
| Steel Manufacturing |   |   | 1,742 |   |   |   | — |   |   |   | 1,886 |   |   |   | — |   |  
| Corporate & other |   |   | (1,699 | ) |   |   | (966 | ) |   |   | (3,195 | ) |   |   | (1,741 | ) |  
|   |   | $ | 11,125 |   |   | $ | 3,068 |   |   | $ | 18,416 |   |   | $ | 6,555 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Depreciation and amortization |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 391 |   |   | $ | 479 |   |   | $ | 738 |   |   | $ | 949 |   |  
| Flooring Manufacturing |   |   | 907 |   |   |   | 887 |   |   |   | 1,872 |   |   |   | 1,492 |   |  
| Steel Manufacturing |   |   | 396 |   |   |   | — |   |   |   | 789 |   |   |   | — |   |  
| Corporate & other |   |   | 11 |   |   |   | 27 |   |   |   | 20 |   |   |   | 37 |   |  
|   |   | $ | 1,706 |   |   | $ | 1,392 |   |   | $ | 3,420 |   |   | $ | 2,477 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Interest expenses |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 582 |   |   | $ | 815 |   |   | $ | 1,242 |   |   | $ | 1,764 |   |  
| Flooring Manufacturing |   |   | 648 |   |   |   | 440 |   |   |   | 1,058 |   |   |   | 830 |   |  
| Steel Manufacturing |   |   | 288 |   |   |   | — |   |   |   | 556 |   |   |   | — |   |  
| Corporate & other |   |   | 131 |   |   |   | 15 |   |   |   | 263 |   |   |   | 33 |   |  
|   |   | $ | 1,649 |   |   | $ | 1,270 |   |   | $ | 3,119 |   |   | $ | 2,627 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Net income (loss) before provision for income taxes |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 4,485 |   |   | $ | 1,205 |   |   | $ | 8,658 |   |   | $ | 1,450 |   |  
| Flooring Manufacturing |   |   | 5,171 |   |   |   | 2,111 |   |   |   | 8,893 |   |   |   | 3,991 |   |  
| Steel Manufacturing |   |   | 2,460 |   |   |   | — |   |   |   | 2,296 |   |   |   | — |   |  
| Corporate & other |   |   | (193 | ) |   |   | (806 | ) |   |   | (1,195 | ) |   |   | (1,596 | ) |  
|   |   | $ | 11,923 |   |   | $ | 2,510 |   |   | $ | 18,652 |   |   | $ | 3,845 |   |    |