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Operating Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Segment Reporting Information [Line Items]          
Revenues $ 136,192 $ 121,552 $ 376,537 $ 370,810  
Cost of Services 113,526 105,899 315,728 321,182  
Gross Profit 22,666 15,653 60,809 49,628  
Selling, General and Administrative Expense 19,110 16,576 55,855 48,104  
Loss (gain) on sale of assets (10) (16) (73) (56)  
Operating Income (Loss) 3,566 (907) 5,027 1,580  
Depreciation and amortization 629 795 1,891 1,956  
Capital Expenditures 527 348 1,422 655  
Assets 178,857 151,473 178,857 151,473 179,252
Communications [Member]
          
Segment Reporting Information [Line Items]          
Revenues 34,783 24,161 84,521 96,085  
Cost of Services 28,086 19,737 69,751 78,599  
Gross Profit 6,697 4,424 14,770 17,486  
Selling, General and Administrative Expense 3,633 3,373 9,778 10,232  
Loss (gain) on sale of assets 0 0 0 0  
Operating Income (Loss) 3,064 1,051 4,992 7,254  
Depreciation and amortization 102 94 303 273  
Capital Expenditures 76 117 127 223  
Assets 29,243 22,058 29,243 22,058  
Residential
          
Segment Reporting Information [Line Items]          
Revenues 49,428 44,511 132,821 119,860  
Cost of Services 39,721 37,400 108,044 99,863  
Gross Profit 9,707 7,111 24,777 19,997  
Selling, General and Administrative Expense 7,325 6,812 20,739 18,452  
Loss (gain) on sale of assets 0 0 (41) (21)  
Operating Income (Loss) 2,382 299 4,079 1,566  
Depreciation and amortization 123 340 364 607  
Capital Expenditures 126 135 289 185  
Assets 38,373 40,450 38,373 40,450  
Commercial & Industrial [Member]
          
Segment Reporting Information [Line Items]          
Revenues 38,878 52,880 122,443 154,865  
Cost of Services 35,158 48,762 108,957 142,720  
Gross Profit 3,720 4,118 13,486 12,145  
Selling, General and Administrative Expense 3,188 3,600 10,911 10,945  
Loss (gain) on sale of assets (10) (16) (35) (35)  
Operating Income (Loss) 542 534 2,610 1,235  
Depreciation and amortization 70 66 203 182  
Capital Expenditures 116 96 171 247  
Assets 46,720 54,236 46,720 54,236  
Infrastructure Solutions [Member]
          
Segment Reporting Information [Line Items]          
Revenues 13,103 0 36,752 0  
Cost of Services 10,561 0 28,976 0  
Gross Profit 2,542 0 7,776 0  
Selling, General and Administrative Expense 2,397 0 7,080 0  
Loss (gain) on sale of assets 0 0 3 0  
Operating Income (Loss) 145 0 693 0  
Depreciation and amortization 248 0 732 0  
Capital Expenditures 209 0 720 0  
Assets 28,552 0 28,552 0  
Corporate
          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Cost of Services 0 0 0 0  
Gross Profit 0 0 0 0  
Selling, General and Administrative Expense 2,567 2,791 7,347 8,475  
Loss (gain) on sale of assets 0 0 0 0  
Operating Income (Loss) (2,567) (2,791) (7,347) (8,475)  
Depreciation and amortization 86 295 289 894  
Capital Expenditures 0 0 115 0  
Assets $ 35,969 $ 34,729 $ 35,969 $ 34,729