| Summary of Segment Information | The following tables summarize segment information for the three months ended December 31, 2020 and 2019:   
|   |   | Three Months Ended December 31, |   |  
|   |   | 2020 |   |   | 2019 |   |  
| Revenues |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 22,370 |   |   | $ | 21,488 |   |  
| Flooring Manufacturing |   |   | 30,222 |   |   |   | 20,367 |   |  
| Steel Manufacturing |   |   | 9,735 |   |   |   | — |   |  
| Corporate & other |   |   | 127 |   |   |   | 146 |   |  
|   |   | $ | 62,454 |   |   | $ | 42,001 |   |  
|   |   |   |   |   |   |   |   |   |  
| Gross profit |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 12,047 |   |   | $ | 11,120 |   |  
| Flooring Manufacturing |   |   | 8,325 |   |   |   | 5,368 |   |  
| Steel Manufacturing |   |   | 1,776 |   |   |   | — |   |  
| Corporate & other |   |   | 121 |   |   |   | 138 |   |  
|   |   | $ | 22,269 |   |   | $ | 16,626 |   |  
|   |   |   |   |   |   |   |   |   |  
| Operating income (loss) |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 4,493 |   |   | $ | 1,859 |   |  
| Flooring Manufacturing |   |   | 4,150 |   |   |   | 2,403 |   |  
| Steel Manufacturing |   |   | 144 |   |   |   | — |   |  
| Corporate & other |   |   | (1,496 | ) |   |   | (775 | ) |  
|   |   | $ | 7,291 |   |   | $ | 3,487 |   |  
|   |   |   |   |   |   |   |   |   |  
| Depreciation and amortization |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 347 |   |   | $ | 470 |   |  
| Flooring Manufacturing |   |   | 965 |   |   |   | 605 |   |  
| Steel Manufacturing |   |   | 393 |   |   |   | — |   |  
| Corporate & other |   |   | 9 |   |   |   | 10 |   |  
|   |   | $ | 1,714 |   |   | $ | 1,085 |   |  
|   |   |   |   |   |   |   |   |   |  
| Interest expenses |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 660 |   |   | $ | 949 |   |  
| Flooring Manufacturing |   |   | 410 |   |   |   | 390 |   |  
| Steel Manufacturing |   |   | 268 |   |   |   | — |   |  
| Corporate & other |   |   | 132 |   |   |   | 18 |   |  
|   |   | $ | 1,470 |   |   | $ | 1,357 |   |  
|   |   |   |   |   |   |   |   |   |  
| Net income (loss) before provision for income taxes |   |   |   |   |   |   |   |   |  
| Retail |   | $ | 4,173 |   |   | $ | 236 |   |  
| Flooring Manufacturing |   |   | 3,722 |   |   |   | 1,880 |   |  
| Steel Manufacturing |   |   | (164 | ) |   |   | — |   |  
| Corporate & other |   |   | (1,002 | ) |   |   | (1,374 | ) |  
|   |   | $ | 6,729 |   |   | $ | 742 |   |    |