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Operation Segments (Tables) | 9 Months Ended
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Jun. 30, 2017
Operating Segments [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended June 30, 2017
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 57,081 |  | $ | 70,162 |  | $ | 58,778 |  | $ | 22,302 |  | $ | - |  | $ | 208,323
Cost of services |  |  | 46,958 |  |  | 54,307 |  |  | 54,174 |  |  | 17,486 |  |  | - |  |  | 172,925
Gross profit |  |  | 10,123 |  |  | 15,855 |  |  | 4,604 |  |  | 4,816 |  |  | - |  |  | 35,398
Selling, general and administrative |  |  | 6,252 |  |  | 11,003 |  |  | 4,849 |  |  | 4,958 |  |  | 3,709 |  |  | 30,771
Contingent consideration |  |  | - |  |  | - |  |  | - |  |  | (33) |  |  | - |  |  | (33)
(Gain) loss on sale of assets |  |  | - |  |  | 37 |  |  | (4) |  |  | (88) |  |  | - |  |  | (55)
Income (loss) from operations |  | $ | 3,871 |  | $ | 4,815 |  | $ | (241) |  | $ | (21) |  | $ | (3,709) |  | $ | 4,715
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 187 |  | $ | 135 |  | $ | 329 |  | $ | 1,785 |  | $ | 70 |  | $ | 2,506
| Capital expenditures |  | $ | 328 |  | $ | 170 |  | $ | 283 |  | $ | 124 |  | $ | - |  | $ | 905
| Total assets |  | $ | 70,427 |  | $ | 51,995 |  | $ | 66,190 |  | $ | 103,323 |  | $ | 125,222 |  | $ | 417,157
|  | 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
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
|  | Nine Months Ended June 30, 2017
|  |  |  |  |  |  |  |  | Commercial & |  | Infrastructure |  |  |  |  |  |
|  |  | Communications |  | Residential |  | Industrial |  | Solutions |  | Corporate |  | Total
Revenues |  | $ | 172,058 |  | $ | 204,527 |  | $ | 168,006 |  | $ | 59,572 |  | $ | - |  | $ | 604,163
Cost of services |  |  | 144,668 |  |  | 157,370 |  |  | 154,628 |  |  | 45,103 |  |  | - |  |  | 501,769
Gross profit |  |  | 27,390 |  |  | 47,157 |  |  | 13,378 |  |  | 14,469 |  |  | - |  |  | 102,394
Selling, general and administrative |  |  | 18,086 |  |  | 32,488 |  |  | 14,434 |  |  | 13,280 |  |  | 10,797 |  |  | 89,085
Contingent consideration |  |  | - |  |  | - |  |  | - |  |  | 50 |  |  | - |  |  | 50
Gain on sale of assets |  |  | (1) |  |  | 34 |  |  | (11) |  |  | (90) |  |  | - |  |  | (68)
Income (loss) from operations |  | $ | 9,305 |  | $ | 14,635 |  | $ | (1,045) |  | $ | 1,229 |  | $ | (10,797) |  | $ | 13,327
Other data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Depreciation and amortization expense |  | $ | 532 |  | $ | 436 |  | $ | 983 |  | $ | 4,730 |  | $ | 203 |  | $ | 6,884
| Capital expenditures |  | $ | 1,888 |  | $ | 517 |  | $ | 927 |  | $ | 261 |  | $ | 203 |  | $ | 3,796
| Total assets |  | $ | 70,427 |  | $ | 51,995 |  | $ | 66,190 |  | $ | 103,323 |  | $ | 125,222 |  | $ | 417,157
|  | 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
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

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