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Operating Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Segment Reporting Information [Line Items]      
Revenues $ 150,766 $ 136,336  
Cost of Services 123,133 113,632  
Gross Profit 27,633 22,704  
Selling, General and Administrative Expense 22,511 18,700  
Loss on sale of assets 1 6  
Operating Income 5,121 3,998  
Depreciation and amortization 816 579  
Capital Expenditures 352 699  
Assets 223,078 198,541 $ 226,710
Communications [Member]      
Segment Reporting Information [Line Items]      
Revenues 40,759 31,808  
Cost of Services 32,602 26,510  
Gross Profit 8,157 5,298  
Selling, General and Administrative Expense 4,713 3,679  
Loss on sale of assets 0 7  
Operating Income 3,444 1,612  
Depreciation and amortization 122 118  
Capital Expenditures 85 192  
Assets 38,896 25,053  
Residential [Member]      
Segment Reporting Information [Line Items]      
Revenues 52,127 48,593  
Cost of Services 40,455 39,405  
Gross Profit 11,672 9,188  
Selling, General and Administrative Expense 8,714 7,301  
Loss on sale of assets 0 0  
Operating Income 2,958 1,887  
Depreciation and amortization 121 123  
Capital Expenditures 42 69  
Assets 37,326 40,317  
Commercial & Industrial [Member]      
Segment Reporting Information [Line Items]      
Revenues 45,265 43,767  
Cost of Services 40,407 38,483  
Gross Profit 4,858 5,284  
Selling, General and Administrative Expense 3,638 3,587  
Loss on sale of assets 0 (1)  
Operating Income 1,220 1,698  
Depreciation and amortization 183 66  
Capital Expenditures 148 8  
Assets 45,630 43,895  
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenues 12,615 12,168  
Cost of Services 9,669 9,234  
Gross Profit 2,946 2,934  
Selling, General and Administrative Expense 2,700 2,019  
Loss on sale of assets 1 0  
Operating Income 245 915  
Depreciation and amortization 322 201  
Capital Expenditures 77 291  
Assets 34,747 27,606  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Cost of Services 0 0  
Gross Profit 0 0  
Selling, General and Administrative Expense 2,746 2,114  
Loss on sale of assets 0 0  
Operating Income (2,746) (2,114)  
Depreciation and amortization 68 71  
Capital Expenditures 0 139  
Assets $ 66,479 $ 61,670