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SEGMENT INFORMATION - Segment financial information (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
SEGMENT INFORMATION                        
Revenue                     $ 411,001,373 $ 351,876,861
Gross profit                     38,775,713 49,954,316
Selling, general, and administrative expenses                     34,560,240 30,119,070
Intangible asset amortization expenses                     1,064,493 438,623
Corporate depreciation expense                     11,962,424 8,539,400
Income from operations $ 3,168,053 $ (8,092,227) $ 1,645,961 $ 8,492,633 $ (1,082,397) $ 3,640,241 $ (6,446,266) $ 2,557,844 $ (3,278,213) $ 11,050,477 4,215,473 19,835,246
Operating Segments                        
SEGMENT INFORMATION                        
Revenue 103,601,585 76,679,151 100,646,114 85,923,760 71,127,655 90,163,187 177,325,265 161,290,842 280,926,850 247,214,602 411,001,373 351,876,861
Segment direct operating expenses (excluding depreciation) 88,583,618 73,670,167 87,898,210 68,537,010 62,851,878 77,332,015 161,568,377 140,183,893 250,151,995 208,720,903 360,627,178 293,691,050
Direct depreciation expense 3,035,369 2,931,124 2,484,322 2,078,926 2,036,223 1,992,211 5,415,446 4,028,434 8,450,815 6,107,360 11,598,482 8,231,495
Gross profit $ 11,982,598 $ 77,860 $ 10,263,582 $ 15,307,824 $ 6,239,554 $ 10,838,961 $ 10,341,442 $ 17,078,515 $ 22,324,040 $ 32,386,339 $ 38,775,713 $ 49,954,316
Segment gross profit percentage 11.60% 0.10% 10.20% 17.80% 8.80% 12.00% 5.80% 10.60% 7.90% 13.10% 9.40% 14.20%
Selling, general, and administrative expenses $ 7,274,677 $ 6,556,611 $ 6,524,653 $ 5,735,316 $ 6,139,860 $ 5,976,948 $ 13,081,264 $ 12,116,808 $ 20,355,941 $ 17,852,124 $ 26,821,376 $ 24,856,592
Indirect depreciation expense 90,429 84,953 82,486 76,194 76,089 75,111 167,439 151,200 257,868 227,394 357,763 303,278
Intangible asset amortization expenses 192,974 141,476 124,809 108,142 108,142 108,142 266,285 216,284 459,259 324,426 1,064,493 438,623
Segment indirect operating expenses $ 7,558,080 $ 6,783,040 $ 6,731,948 $ 5,919,652 $ 6,324,091 $ 6,160,201 $ 13,514,988 $ 12,484,292 $ 21,073,068 $ 18,403,944 $ 28,243,632 $ 25,598,493
Segment operating margin percentage 4.30% (8.70%) 3.50% 10.90% (0.10%) 5.20% (1.80%) 2.80% 0.40% 5.70% 2.60% 6.90%
Income from operations $ 4,424,518 $ (6,705,180) $ 3,531,634 $ 9,388,172 $ (84,537) $ 4,678,760 $ (3,173,546) $ 4,594,223 $ 1,250,972 $ 13,982,395 $ 10,532,081 $ 24,355,823
Operating Segments | Underground Infrastructure Construction                        
SEGMENT INFORMATION                        
Revenue 55,384,307 32,544,499 52,820,146 45,477,986 34,330,863 52,107,145 85,364,645 86,438,008 140,748,952 131,915,994 222,966,841 189,104,106
Segment direct operating expenses (excluding depreciation) 45,879,667 34,472,373 45,045,769 34,784,050 30,237,638 43,570,180 79,518,142 73,807,818 125,397,809 108,591,868 195,094,334 152,792,852
Direct depreciation expense 2,410,049 2,299,065 1,842,414 1,494,558 1,473,250 1,459,758 4,141,479 2,933,008 6,551,528 4,427,566 9,080,976 5,955,467
Gross profit $ 7,094,591 $ (4,226,939) $ 5,931,963 $ 9,199,378 $ 2,619,975 $ 7,077,207 $ 1,705,024 $ 9,697,182 $ 8,799,615 $ 18,896,560 $ 18,791,531 $ 30,355,787
Segment gross profit percentage 12.80% (13.00%) 11.20% 20.20% 7.60% 13.60% 2.00% 11.20% 6.30% 14.30% 8.40% 16.10%
Selling, general, and administrative expenses $ 5,530,973 $ 4,780,036 $ 4,759,449 $ 4,090,563 $ 4,523,010 $ 4,473,880 $ 9,539,485 $ 8,996,890 $ 15,070,458 $ 13,087,453 $ 19,685,274 $ 18,365,153
Intangible asset amortization expenses 174,812 141,476 124,809 108,142 108,142 108,142 266,285 216,284 441,097 324,426 1,040,277 432,569
Segment indirect operating expenses $ 5,705,785 $ 4,921,512 $ 4,884,258 $ 4,198,705 $ 4,631,152 $ 4,582,022 $ 9,805,770 $ 9,213,174 $ 15,511,555 $ 13,411,879 $ 20,725,551 $ 18,797,722
Segment operating margin percentage 2.50% (28.10%) 2.00% 11.00% (5.90%) 4.80% (9.50%) 0.60% (4.80%) 4.20% (0.90%) 6.10%
Income from operations $ 1,388,806 $ (9,148,451) $ 1,047,705 $ 5,000,673 $ (2,011,177) $ 2,495,185 $ (8,100,746) $ 484,008 $ (6,711,940) $ 5,484,681 $ (1,934,020) $ 11,558,065
Operating Segments | Industrial Construction                        
SEGMENT INFORMATION                        
Revenue 35,044,725 32,694,332 35,396,513 26,634,201 24,473,527 22,637,486 68,090,845 47,111,013 103,135,570 73,745,214 138,935,139 104,054,034
Segment direct operating expenses (excluding depreciation) 31,393,379 29,345,599 31,870,920 21,887,962 21,994,382 20,443,726 61,216,519 42,438,108 92,609,898 64,326,070 123,226,874 90,504,731
Direct depreciation expense 625,320 632,059 641,908 584,368 562,973 532,453 1,273,967 1,095,426 1,899,287 1,679,794 2,517,506 2,276,028
Gross profit $ 3,026,026 $ 2,716,674 $ 2,883,685 $ 4,161,871 $ 1,916,172 $ 1,661,307 $ 5,600,359 $ 3,577,479 $ 8,626,385 $ 7,739,350 $ 13,190,759 $ 11,273,275
Segment gross profit percentage 8.60% 8.30% 8.10% 15.60% 7.80% 7.30% 8.20% 7.60% 8.40% 10.50% 9.50% 10.80%
Selling, general, and administrative expenses $ 1,029,731 $ 980,765 $ 983,393 $ 862,948 $ 796,106 $ 766,937 $ 1,964,158 $ 1,563,043 $ 2,993,889 $ 2,425,991 $ 3,966,742 $ 3,358,644
Intangible asset amortization expenses 18,162               18,162   24,216 6,054
Segment indirect operating expenses $ 1,047,893 $ 980,765 $ 983,393 $ 862,948 $ 796,106 $ 766,937 $ 1,964,158 $ 1,563,043 $ 3,012,051 $ 2,425,991 $ 3,990,958 $ 3,364,698
Segment operating margin percentage 5.60% 5.30% 5.40% 12.40% 4.60% 4.00% 5.30% 4.30% 5.40% 7.20% 6.60% 7.60%
Income from operations $ 1,978,133 $ 1,735,909 $ 1,900,292 $ 3,298,923 $ 1,120,066 $ 894,370 $ 3,636,201 $ 2,014,436 $ 5,614,334 $ 5,313,359 $ 9,199,801 $ 7,908,577
Operating Segments | Building Construction                        
SEGMENT INFORMATION                        
Revenue 13,172,553 11,440,320 12,429,455 13,811,573 12,323,265 15,418,556 23,869,775 27,741,821 37,042,328 41,553,394 49,099,393 58,718,721
Segment direct operating expenses (excluding depreciation) 11,310,572 9,852,195 10,981,521 11,864,998 10,619,858 13,318,109 20,833,716 23,937,967 32,144,288 35,802,965 42,305,970 50,393,467
Gross profit $ 1,861,981 $ 1,588,125 $ 1,447,934 $ 1,946,575 $ 1,703,407 $ 2,100,447 $ 3,036,059 $ 3,803,854 $ 4,898,040 $ 5,750,429 $ 6,793,423 $ 8,325,254
Segment gross profit percentage 14.10% 13.90% 11.60% 14.10% 13.80% 13.60% 12.70% 13.70% 13.20% 13.80% 13.80% 14.20%
Selling, general, and administrative expenses $ 713,973 $ 795,810 $ 781,811 $ 781,805 $ 820,744 $ 736,131 $ 1,577,621 $ 1,556,875 $ 2,291,594 $ 2,338,680 $ 3,169,360 $ 3,132,795
Indirect depreciation expense 90,429 84,953 82,486 76,194 76,089 75,111 167,439 151,200 257,868 227,394 357,763 303,278
Segment indirect operating expenses $ 804,402 $ 880,763 $ 864,297 $ 857,999 $ 896,833 $ 811,242 $ 1,745,060 $ 1,708,075 $ 2,549,462 $ 2,566,074 $ 3,527,123 $ 3,436,073
Segment operating margin percentage 8.00% 6.20% 4.70% 7.90% 6.50% 8.40% 5.40% 7.60% 6.30% 7.70% 6.70% 8.30%
Income from operations $ 1,057,579 $ 707,362 $ 583,637 $ 1,088,576 $ 806,574 $ 1,289,205 $ 1,290,999 $ 2,095,779 $ 2,348,578 $ 3,184,355 $ 3,266,300 $ 4,889,181
Corporate                        
SEGMENT INFORMATION                        
Corporate and non-allocated costs 1,255,048 1,384,859 1,884,516 894,383 996,703 1,037,362 3,269,375 2,034,065 4,524,423 2,928,448 6,310,429 4,515,950
Corporate depreciation expense $ 1,417 $ 2,188 $ 1,157 $ 1,156 $ 1,157 $ 1,157 $ 3,345 $ 2,314 $ 4,762 $ 3,470 $ 6,179 $ 4,627