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Operating Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2012
Segment Reporting Information [Line Items]          
Revenues $ 121,552 $ 116,128 $ 370,810 $ 332,734  
Cost of Services 105,899 101,872 321,182 291,496  
Gross Profit 15,653 14,256 49,628 41,238  
Selling, General and Administrative Expense 16,576 14,956 48,104 42,048  
Loss (gain) on sale of assets (16) (9) (56) (165)  
Operating Income (Loss) (907) (691) 1,580 (645)  
Depreciation and amortization 795 518 1,956 1,537  
Capital Expenditures 348 350 655 1,744  
Assets 151,473 172,105 151,473 172,105 164,713
Communications
          
Segment Reporting Information [Line Items]          
Revenues 24,161 31,068 96,085 84,660  
Cost of Services 19,737 26,839 78,599 72,809  
Gross Profit 4,424 4,229 17,486 11,851  
Selling, General and Administrative Expense 3,373 4,219 10,232 10,094  
Loss (gain) on sale of assets 0 0 0 (61)  
Operating Income (Loss) 1,051 10 7,254 1,818  
Depreciation and amortization 94 66 273 183  
Capital Expenditures 117 0 223 260  
Assets 22,058 34,240 22,058 34,240  
Residential
          
Segment Reporting Information [Line Items]          
Revenues 44,511 35,232 119,860 94,132  
Cost of Services 37,400 29,655 99,863 79,376  
Gross Profit 7,111 5,577 19,997 14,756  
Selling, General and Administrative Expense 6,812 5,163 18,452 14,109  
Loss (gain) on sale of assets 0 1 (21) 8  
Operating Income (Loss) 299 413 1,566 639  
Depreciation and amortization 340 99 607 271  
Capital Expenditures 135 286 185 554  
Assets 40,450 29,201 40,450 29,201  
Commercial & Industrial
          
Segment Reporting Information [Line Items]          
Revenues 52,880 49,828 154,865 153,942  
Cost of Services 48,762 45,378 142,720 139,311  
Gross Profit 4,118 4,450 12,145 14,631  
Selling, General and Administrative Expense 3,600 3,788 10,945 12,396  
Loss (gain) on sale of assets (16) (10) (35) (112)  
Operating Income (Loss) 534 672 1,235 2,347  
Depreciation and amortization 66 50 182 190  
Capital Expenditures 96 49 247 54  
Assets 54,237 63,465 54,237 63,465  
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 2,791 1,786 8,475 5,449  
Loss (gain) on sale of assets 0 0 0 0  
Operating Income (Loss) (2,791) (1,786) (8,475) (5,449)  
Depreciation and amortization 295 303 894 893  
Capital Expenditures 0 15 0 876  
Assets $ 34,728 $ 45,199 $ 34,728 $ 45,199