| Schedule of segment financial information |
| | | | | | | | | | | | | | | | Underground | | | | | | | | | | | | | Infrastructure | | Industrial | | Building | | | | | Three Months Ended June 30, 2026 | | Construction | | Construction | | Construction | | Total | | Revenues | | $ | 71,439,367 | | $ | 44,677,594 | | $ | 13,888,967 | | $ | 130,005,928 | | Segment direct operating expenses (excluding depreciation) | | | 61,342,374 | | | 38,654,003 | | | 12,442,374 | | | 112,438,751 | | Direct depreciation expense | | | 2,579,382 | | | 670,570 | | | — | | | 3,249,952 | | Segment gross profit | | | 7,517,611 | | | 5,353,021 | | | 1,446,593 | | | 14,317,225 | | Segment gross profit percentage | | | 10.5 | % | | 12.0 | % | | 10.4 | % | | 11.0 | % | Selling, general, and administrative expenses | | | 5,513,469 | | | 1,160,147 | | | 960,531 | | | 7,634,147 | | Indirect depreciation expense | | | — | | | — | | | 112,640 | | | 112,640 | | Intangible asset amortization expenses | | | 311,547 | | | 54,720 | | | — | | | 366,267 | | Segment indirect operating expenses | | | 5,825,016 | | | 1,214,867 | | | 1,073,171 | | | 8,113,054 | | Segment income from operations | | | 1,692,595 | | | 4,138,154 | | | 373,422 | | | 6,204,171 | | Segment operating margin percentage | | | 2.4 | % | | 9.3 | % | | 2.7 | % | | 4.8 | % | Corporate and non-allocated costs | | | | | | | | | | | | 1,567,530 | | Corporate depreciation expense | | | | | | | | | | | | 4,721 | | Total consolidated income from operations | | | | | | | | | | | $ | 4,631,920 | |
| | | | | | | | | | | | | | | | Underground | | | | | | | | | | | | | Infrastructure | | Industrial | | Building | | | | | Nine Months Ended June 30, 2026 | | Construction | | Construction | | Construction | | Total | | Revenues | | $ | 186,885,975 | | $ | 114,821,093 | | $ | 35,584,502 | | $ | 337,291,570 | | Segment direct operating expenses (excluding depreciation) | | | 157,591,501 | | | 99,801,182 | | | 31,611,363 | | | 289,004,046 | | Direct depreciation expense | | | 7,766,653 | | | 1,977,518 | | | — | | | 9,744,171 | | Segment gross profit | | | 21,527,821 | | | 13,042,393 | | | 3,973,139 | | | 38,543,353 | | Segment gross profit percentage | | | 11.5 | % | | 11.4 | % | | 11.2 | % | | 11.4 | % | Selling, general, and administrative expenses | | | 15,449,819 | | | 3,295,886 | | | 3,062,012 | | | 21,807,717 | | Indirect depreciation expense | | | — | | | — | | | 337,914 | | | 337,914 | | Intangible asset amortization expenses | | | 898,002 | | | 164,160 | | | — | | | 1,062,162 | | Segment indirect operating expenses | | | 16,347,821 | | | 3,460,046 | | | 3,399,926 | | | 23,207,793 | | Segment income from operations | | $ | 5,180,000 | | $ | 9,582,347 | | $ | 573,213 | | $ | 15,335,560 | | Segment operating margin percentage | | | 2.8 | % | | 8.3 | % | | 1.6 | % | | 4.5 | % | Corporate and non-allocated costs | | | | | | | | | | | | 4,722,470 | | Corporate depreciation expense | | | | | | | | | | | | 9,994 | | Total consolidated income from operations | | | | | | | | | | | $ | 10,603,096 | |
| | | | | | | | | | | | | At June 30, 2026 | | | | | | | | | | | | | | | Underground | | | | | | | | | | | | Infrastructure | | | Industrial | | Building | | | | Property, plant and equipment, at cost, less accumulated depreciation | | Construction | | Construction | | Construction | | Total | Segments | | $ | 37,409,209 | | $ | 14,321,956 | | $ | 1,122,837 | | $ | 52,854,002 | Corporate | | | — | | | — | | | — | | | 90,407 | Total | | $ | 37,409,209 | | $ | 14,321,956 | | $ | 1,122,837 | | $ | 52,944,409 |
| | | | | | | | | | | | | | | | Underground | | | | | | | | | | | | | Infrastructure | | Industrial | | Building | | | | | Three Months Ended June 30, 2025 | | Construction | | Construction | | Construction | | Total | | Revenues | | $ | 55,384,307 | | $ | 35,044,725 | | $ | 13,172,553 | | $ | 103,601,585 | | Segment direct operating expenses (excluding depreciation) | | | 45,879,667 | | | 31,393,379 | | | 11,310,572 | | | 88,583,618 | | Direct depreciation expense | | | 2,410,049 | | | 625,320 | | | — | | | 3,035,369 | | Segment gross profit | | | 7,094,591 | | | 3,026,026 | | | 1,861,981 | | | 11,982,598 | | Segment gross profit percentage | | | 12.8 | % | | 8.6 | % | | 14.1 | % | | 11.6 | % | Selling, general, and administrative expenses | | | 5,530,973 | | | 1,029,731 | | | 713,973 | | | 7,274,677 | | Indirect depreciation expense | | | — | | | — | | | 90,429 | | | 90,429 | | Intangible asset amortization expenses | | | 174,812 | | | 18,162 | | | — | | | 192,974 | | Segment indirect operating expenses | | | 5,705,785 | | | 1,047,893 | | | 804,402 | | | 7,558,080 | | Segment income from operations | | | 1,388,806 | | | 1,978,133 | | | 1,057,579 | | | 4,424,518 | | Segment operating margin percentage | | | 2.5 | % | | 5.6 | % | | 8.0 | % | | 4.3 | % | Corporate and non-allocated costs | | | | | | | | | | | | 1,255,048 | | Corporate depreciation expense | | | | | | | | | | | | 1,417 | | Total consolidated income from operations | | | | | | | | | | | $ | 3,168,053 | |
| | | | | | | | | | | | | | | | Underground | | | | | | | | | | | | | Infrastructure | | Industrial | | Building | | | | | Nine Months Ended June 30, 2025 | | Construction | | Construction | | Construction | | Total | | Revenues | | $ | 140,748,952 | | $ | 103,135,570 | | $ | 37,042,328 | | $ | 280,926,850 | | Segment direct operating expenses (excluding depreciation) | | | 125,397,809 | | | 92,609,898 | | | 32,144,288 | | | 250,151,995 | | Direct depreciation expense | | | 6,551,528 | | | 1,899,287 | | | — | | | 8,450,815 | | Segment gross profit | | | 8,799,615 | | | 8,626,385 | | | 4,898,040 | | | 22,324,040 | | Segment gross profit percentage | | | 6.3 | % | | 8.4 | % | | 13.2 | % | | 7.9 | % | Selling, general, and administrative expenses | | | 15,070,458 | | | 2,993,889 | | | 2,291,594 | | | 20,355,941 | | Indirect depreciation expense | | | — | | | — | | | 257,868 | | | 257,868 | | Intangible asset amortization expenses | | | 441,097 | | | 18,162 | | | — | | | 459,259 | | Segment indirect operating expenses | | | 15,511,555 | | | 3,012,051 | | | 2,549,462 | | | 21,073,068 | | Segment (loss) income from operations | | | (6,711,940) | | | 5,614,334 | | | 2,348,578 | | | 1,250,972 | | Segment operating margin percentage | | | (4.8) | % | | 5.4 | % | | 6.3 | % | | 0.4 | % | Corporate and non-allocated costs | | | | | | | | | | | | 4,524,423 | | Corporate depreciation expense | | | | | | | | | | | | 4,762 | | Total loss from operations | | | | | | | | | | | $ | (3,278,213) | |
| | | | | | | | | | | | | At June 30, 2025 | | | | | | | | | | | | | | | Underground | | | | | | | | | | | | Infrastructure | | | Industrial | | Building | | | | Property, plant and equipment, at cost, less accumulated depreciation | | Construction | | Construction | | Construction | | Total | Segments | | $ | 39,016,246 | | $ | 14,058,440 | | $ | 976,689 | | $ | 54,051,375 | Corporate | | | — | | | — | | | — | | | 39,276 | Total | | $ | 39,016,246 | | $ | 14,058,440 | | $ | 976,689 | | $ | 54,090,651 |
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