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Operation Segments (Tables) | 12 Months Ended
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Sep. 30, 2017
Operating Segments [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Years Ended September 30, 2017
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Corporate |  | Total
Revenues |  | $ | 227,606 |  | $ | 225,275 |  | $ | 83,824 |  | $ | 274,039 |  | $ | - |  | $ | 810,744
Cost of services |  |  | 208,619 |  |  | 187,419 |  |  | 63,399 |  |  | 210,809 |  |  | - |  |  | 670,246
Gross profit |  |  | 18,987 |  |  | 37,856 |  |  | 20,425 |  |  | 63,230 |  |  | - |  |  | 140,498
Selling, general and administrative |  |  | 20,170 |  |  | 24,219 |  |  | 17,859 |  |  | 43,689 |  |  | 14,433 |  |  | 120,370
Contingent consideration |  |  | - |  |  | - |  |  | (145) |  |  | - |  |  | - |  |  | (145)
Loss (gain) on sale of assets |  |  | (32) |  |  | (1) |  |  | (79) |  |  | 43 |  |  | - |  |  | (69)
Income (loss) from operations |  | $ | (1,151) |  | $ | 13,638 |  | $ | 2,790 |  | $ | 19,498 |  | $ | (14,433) |  | $ | 20,342
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 1,648 |  | $ | 740 |  | $ | 6,412 |  | $ | 565 |  | $ | 269 |  | $ | 9,634
| Capital expenditures |  | $ | 1,241 |  | $ | 2,046 |  | $ | 538 |  | $ | 561 |  | $ | 203 |  | $ | 4,589
| Total assets |  | $ | 84,757 |  | $ | 63,917 |  | $ | 106,114 |  | $ | 51,994 |  | $ | 117,712 |  | $ | 424,494
|  | Years Ended September 30, 2016
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Corporate |  | Total
Revenues |  | $ | 222,466 |  | $ | 189,635 |  | $ | 58,003 |  | $ | 225,889 |  | $ | - |  | $ | 695,993
Cost of services |  |  | 197,679 |  |  | 157,104 |  |  | 42,356 |  |  | 171,874 |  |  | - |  |  | 569,013
Gross profit |  |  | 24,787 |  |  | 32,531 |  |  | 15,647 |  |  | 54,015 |  |  | - |  |  | 126,980
Selling, general and administrative |  |  | 17,169 |  |  | 20,839 |  |  | 12,404 |  |  | 37,585 |  |  | 12,561 |  |  | 100,558
Contingent consideration |  |  | - |  |  | - |  |  | 652 |  |  | - |  |  | - |  |  | 652
Loss (gain) on sale of assets |  |  | (17) |  |  | - |  |  | 826 |  |  | 1 |  |  | - |  |  | 810
Income (loss) from operations |  | $ | 7,635 |  | $ | 11,692 |  | $ | 1,765 |  | $ | 16,429 |  | $ | (12,561) |  | $ | 24,960
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 1,234 |  | $ | 577 |  | $ | 3,072 |  | $ | 509 |  | $ | 272 |  | $ | 5,664
| Capital expenditures |  | $ | 795 |  | $ | 1,102 |  | $ | 721 |  | $ | 704 |  | $ | 95 |  | $ | 3,417
| Total assets |  | $ | 59,763 |  | $ | 68,018 |  | $ | 89,447 |  | $ | 43,195 |  | $ | 133,917 |  | $ | 394,340
|  | Years Ended September 30, 2015
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Corporate |  | Total
Revenues |  | $ | 178,865 |  | $ | 141,858 |  | $ | 46,827 |  | $ | 206,307 |  | $ | - |  | $ | 573,857
Cost of services |  |  | 157,322 |  |  | 116,015 |  |  | 36,194 |  |  | 164,435 |  |  | - |  |  | 473,966
Gross profit |  |  | 21,543 |  |  | 25,843 |  |  | 10,633 |  |  | 41,872 |  |  | - |  |  | 99,891
Selling, general and administrative |  |  | 15,027 |  |  | 15,735 |  |  | 9,498 |  |  | 31,877 |  |  | 9,279 |  |  | 81,416
Loss (gain) on sale of assets |  |  | (11) |  |  | (18) |  |  | 12 |  |  | 4 |  |  | - |  |  | (13)
Income (loss) from operations |  | $ | 6,527 |  | $ | 10,126 |  | $ | 1,123 |  | $ | 9,991 |  | $ | (9,279) |  | $ | 18,488
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 283 |  | $ | 512 |  | $ | 952 |  | $ | 485 |  | $ | 277 |  | $ | 2,509
| Capital expenditures |  | $ | 391 |  | $ | 675 |  | $ | 1,197 |  | $ | 352 |  | $ | 164 |  | $ | 2,779
| Total assets |  | $ | 44,156 |  | $ | 49,500 |  | $ | 30,112 |  | $ | 37,755 |  | $ | 64,156 |  | $ | 225,679

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