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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]                      
Revenues $ 159,687 $ 144,082 $ 133,752 $ 136,336 $ 135,858 $ 136,192 $ 120,266 $ 120,079 $ 573,857 $ 512,395 $ 494,593
Cost of Services                 473,966 429,269 427,633
Gross Profit 30,427 $ 25,052 $ 21,708 $ 22,704 22,318 $ 22,666 $ 20,026 $ 18,116 99,891 83,126 66,960
Selling, General and Administrative Expense                 81,416 75,571 66,598
Loss (gain) on sale of assets                 (13) (86) (64)
Operating Income (Loss)                 18,488 7,641 426
Depreciation and amortization                 2,509 2,526 2,552
Capital Expenditures                 2,779 1,982 753
Assets 226,710       201,108       226,710 201,108 179,252
Communications [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 141,858 116,073 126,348
Cost of Services                 116,015 94,904 102,564
Gross Profit                 25,843 21,169 23,784
Selling, General and Administrative Expense                 15,735 13,481 13,610
Loss (gain) on sale of assets                 (18) 6 0
Operating Income (Loss)                 10,126 7,682 10,174
Depreciation and amortization                 512 414 372
Capital Expenditures                 675 331 269
Assets 49,500       30,415       49,500 30,415 24,858
Residential                      
Segment Reporting Information [Line Items]                      
Revenues                 206,307 182,514 162,611
Cost of Services                 164,435 148,685 135,384
Gross Profit                 41,872 33,829 27,227
Selling, General and Administrative Expense                 31,877 27,947 25,447
Loss (gain) on sale of assets                 4 4 (17)
Operating Income (Loss)                 9,991 5,878 1,797
Depreciation and amortization                 485 491 807
Capital Expenditures                 352 420 209
Assets 37,755       40,555       37,755 40,555 36,838
Commercial & Industrial [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 178,865 166,249 203,481
Cost of Services                 157,322 148,081 187,957
Gross Profit                 21,543 18,168 15,524
Selling, General and Administrative Expense                 15,027 14,479 14,362
Loss (gain) on sale of assets                 (11) (46) (46)
Operating Income (Loss)                 6,527 3,735 1,208
Depreciation and amortization                 283 270 247
Capital Expenditures                 391 266 270
Assets 44,156       43,937       44,156 43,937 55,342
MISCOR [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 46,827 47,559 2,153
Cost of Services                 36,194 37,599 1,728
Gross Profit                 10,633 9,960 425
Selling, General and Administrative Expense                 9,498 9,346 337
Loss (gain) on sale of assets                 12 (50) 0
Operating Income (Loss)                 1,123 664 88
Depreciation and amortization                 952 980 38
Capital Expenditures                 1,197 828 5
Assets 30,112       27,272       30,112 27,272 27,889
Corporate                      
Segment Reporting Information [Line Items]                      
Revenues                 0 0 0
Cost of Services                 0 0 0
Gross Profit                 0 0 0
Selling, General and Administrative Expense                 9,279 10,318 12,842
Loss (gain) on sale of assets                 0 0 (1)
Operating Income (Loss)                 (9,279) (10,318) (12,841)
Depreciation and amortization                 277 371 1,088
Capital Expenditures                 164 137 0
Assets $ 65,187       $ 58,929       $ 65,187 $ 58,929 $ 34,325