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Operation Segments (Tables) | 12 Months Ended
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Sep. 30, 2016
Operating Segments [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Years Ended September 30, 2016
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 189,635 |  | $ | 225,889 |  | $ | 222,466 |  | $ | 58,003 |  | $ | - |  | $ | 695,993
Cost of services |  |  | 157,104 |  |  | 171,874 |  |  | 197,679 |  |  | 42,356 |  |  | - |  |  | 569,013
Gross profit |  |  | 32,531 |  |  | 54,015 |  |  | 24,787 |  |  | 15,647 |  |  | - |  |  | 126,980
Selling, general and administrative |  |  | 20,839 |  |  | 37,585 |  |  | 17,169 |  |  | 12,404 |  |  | 12,561 |  |  | 100,558
Contingent consideration |  |  | - |  |  | - |  |  | - |  |  | 652 |  |  | - |  |  | 652
Loss (gain) on sale of assets |  |  | - |  |  | 1 |  |  | (17) |  |  | 826 |  |  | - |  |  | 810
Income (loss) from operations |  | $ | 11,692 |  | $ | 16,429 |  | $ | 7,635 |  | $ | 1,765 |  | $ | (12,561) |  | $ | 24,960
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 577 |  | $ | 509 |  | $ | 1,234 |  | $ | 3,072 |  | $ | 272 |  | $ | 5,664
| Capital expenditures |  |  | 1,102 |  |  | 704 |  |  | 795 |  |  | 721 |  |  | 95 |  |  | 3,417
| Total assets |  | $ | 68,018 |  | $ | 43,195 |  | $ | 59,763 |  | $ | 89,447 |  | $ | 133,917 |  | $ | 394,340
|  | Years Ended September 30, 2015
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 141,858 |  | $ | 206,307 |  | $ | 178,865 |  | $ | 46,827 |  | $ | - |  | $ | 573,857
Cost of services |  |  | 116,015 |  |  | 164,435 |  |  | 157,322 |  |  | 36,194 |  |  | - |  |  | 473,966
Gross profit |  |  | 25,843 |  |  | 41,872 |  |  | 21,543 |  |  | 10,633 |  |  | - |  |  | 99,891
Selling, general and administrative |  |  | 15,735 |  |  | 31,877 |  |  | 15,027 |  |  | 9,498 |  |  | 9,279 |  |  | 81,416
Loss (gain) on sale of assets |  |  | (18) |  |  | 4 |  |  | (11) |  |  | 12 |  |  | - |  |  | (13)
Income (loss) from operations |  | $ | 10,126 |  | $ | 9,991 |  | $ | 6,527 |  | $ | 1,123 |  | $ | (9,279) |  | $ | 18,488
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 512 |  | $ | 485 |  | $ | 283 |  | $ | 952 |  | $ | 277 |  | $ | 2,509
| Capital expenditures |  |  | 675 |  |  | 352 |  |  | 391 |  |  | 1,197 |  |  | 164 |  |  | 2,779
| Total assets |  | $ | 49,500 |  | $ | 37,755 |  | $ | 44,156 |  | $ | 30,112 |  | $ | 64,156 |  | $ | 225,679
|  | Years Ended September 30, 2014
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 116,073 |  | $ | 182,514 |  | $ | 166,249 |  | $ | 47,559 |  | $ | - |  | $ | 512,395
Cost of services |  |  | 94,904 |  |  | 148,685 |  |  | 148,081 |  |  | 37,599 |  |  | - |  |  | 429,269
Gross profit |  |  | 21,169 |  |  | 33,829 |  |  | 18,168 |  |  | 9,960 |  |  | - |  |  | 83,126
Selling, general and administrative |  |  | 13,481 |  |  | 27,947 |  |  | 14,479 |  |  | 9,346 |  |  | 10,318 |  |  | 75,571
Loss (gain) on sale of assets |  |  | 6 |  |  | 4 |  |  | (46) |  |  | (50) |  |  | - |  |  | (86)
Income (loss) from operations |  | $ | 7,682 |  | $ | 5,878 |  | $ | 3,735 |  | $ | 664 |  | $ | (10,318) |  | $ | 7,641
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 414 |  | $ | 491 |  | $ | 270 |  | $ | 980 |  | $ | 371 |  | $ | 2,526
| Capital expenditures |  |  | 331 |  |  | 420 |  |  | 266 |  |  | 828 |  |  | 137 |  |  | 1,982
| Total assets |  | $ | 30,415 |  | $ | 40,555 |  | $ | 43,937 |  | $ | 27,272 |  | $ | 57,771 |  | $ | 199,950

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