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Operation Segments (Tables) | 9 Months Ended
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Jun. 30, 2016
Operating Segments [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended June 30, 2016
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 48,702 |  | $ | 56,867 |  | $ | 59,512 |  | $ | 14,518 |  | $ | - |  | $ | 179,599
Cost of services |  |  | 40,487 |  |  | 43,388 |  |  | 51,882 |  |  | 9,845 |  |  | - |  |  | 145,602
Gross profit |  |  | 8,215 |  |  | 13,479 |  |  | 7,630 |  |  | 4,673 |  |  | - |  |  | 33,997
Selling, general and administrative |  |  | 5,185 |  |  | 9,237 |  |  | 4,771 |  |  | 3,248 |  |  | 3,275 |  |  | 25,716
Contingent consideration |  |  | - |  |  | - |  |  | - |  |  | 66 |  |  | - |  |  | 66
(Gain) loss on sale of assets |  |  | - |  |  | - |  |  | (17) |  |  | 51 |  |  | - |  |  | 34
Income (loss) from operations |  | $ | 3,030 |  | $ | 4,242 |  | $ | 2,876 |  | $ | 1,308 |  | $ | (3,275) |  | $ | 8,181
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 153 |  | $ | 122 |  | $ | 410 |  | $ | 897 |  | $ | 74 |  | $ | 1,656
| Capital expenditures |  | $ | 122 |  | $ | 393 |  | $ | 377 |  | $ | 109 |  | $ | 71 |  | $ | 1,072
| Total assets |  | $ | 53,711 |  | $ | 40,008 |  | $ | 58,559 |  | $ | 92,559 |  | $ | 32,686 |  | $ | 277,523
|  | Three Months Ended June 30, 2015
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 35,516 |  | $ | 52,991 |  | $ | 44,406 |  | $ | 11,169 |  | $ | - |  | $ | 144,082
Cost of services |  |  | 28,451 |  |  | 42,615 |  |  | 39,161 |  |  | 8,803 |  |  | - |  |  | 119,030
Gross profit |  |  | 7,065 |  |  | 10,376 |  |  | 5,245 |  |  | 2,366 |  |  | - |  |  | 25,052
Selling, general and administrative |  |  | 4,275 |  |  | 7,709 |  |  | 3,776 |  |  | 2,463 |  |  | 2,323 |  |  | 20,546
Gain on sale of assets |  |  | (31) |  |  | - |  |  | (16) |  |  | - |  |  | - |  |  | (47)
Income (loss) from operations |  | $ | 2,821 |  | $ | 2,667 |  | $ | 1,485 |  | $ | (97) |  | $ | (2,323) |  | $ | 4,553
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 141 |  | $ | 120 |  | $ | 71 |  | $ | 236 |  | $ | 68 |  | $ | 636
| Capital expenditures |  | $ | 174 |  | $ | 64 |  | $ | 130 |  | $ | 366 |  | $ | - |  | $ | 734
| Total assets |  | $ | 39,096 |  | $ | 37,690 |  | $ | 45,776 |  | $ | 28,266 |  | $ | 61,678 |  | $ | 212,506
|  | Nine Months Ended June 30, 2016
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 128,813 |  | $ | 162,381 |  | $ | 158,923 |  | $ | 40,230 |  | $ | - |  | $ | 490,347
Cost of services |  |  | 105,855 |  |  | 124,459 |  |  | 141,237 |  |  | 29,354 |  |  | - |  |  | 400,905
Gross profit |  |  | 22,958 |  |  | 37,922 |  |  | 17,686 |  |  | 10,876 |  |  | - |  |  | 89,442
Selling, general and administrative |  |  | 14,877 |  |  | 26,856 |  |  | 13,014 |  |  | 9,062 |  |  | 8,685 |  |  | 72,494
Contingent consideration |  |  | - |  |  | - |  |  | - |  |  | 332 |  |  | - |  |  | 332
(Gain) loss on sale of assets |  |  | - |  |  | - |  |  | (17) |  |  | 828 |  |  | - |  |  | 811
Income (loss) from operations |  | $ | 8,081 |  | $ | 11,066 |  | $ | 4,689 |  | $ | 654 |  | $ | (8,685) |  | $ | 15,805
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 410 |  | $ | 364 |  | $ | 845 |  | $ | 1,674 |  | $ | 210 |  | $ | 3,503
| Capital expenditures |  | $ | 685 |  | $ | 537 |  | $ | 563 |  | $ | 300 |  | $ | 71 |  | $ | 2,156
| Total assets |  | $ | 53,711 |  | $ | 40,008 |  | $ | 58,559 |  | $ | 92,559 |  | $ | 32,686 |  | $ | 277,523
|  | Nine Months Ended June 30, 2015
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 95,269 |  | $ | 151,753 |  | $ | 132,677 |  | $ | 34,471 |  | $ | - |  | $ | 414,170
Cost of services |  |  | 78,132 |  |  | 122,523 |  |  | 117,331 |  |  | 26,721 |  |  | - |  |  | 344,707
Gross profit |  |  | 17,137 |  |  | 29,230 |  |  | 15,346 |  |  | 7,750 |  |  | - |  |  | 69,463
Selling, general and administrative |  |  | 11,377 |  |  | 22,741 |  |  | 11,155 |  |  | 6,795 |  |  | 6,585 |  |  | 58,653
(Gain) loss on sale of assets |  |  | (24) |  |  | 4 |  |  | (18) |  |  | (2) |  |  | - |  |  | (40)
Income (loss) from operations |  | $ | 5,784 |  | $ | 6,485 |  | $ | 4,209 |  | $ | 957 |  | $ | (6,585) |  | $ | 10,850
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 388 |  | $ | 362 |  | $ | 207 |  | $ | 640 |  | $ | 209 |  | $ | 1,806
| Capital expenditures |  | $ | 644 |  | $ | 257 |  | $ | 297 |  | $ | 1,023 |  | $ | 164 |  | $ | 2,385
| Total assets |  | $ | 39,096 |  | $ | 37,690 |  | $ | 45,776 |  | $ | 28,266 |  | $ | 61,678 |  | $ | 212,506

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