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Operation Segments (Tables)
3 Months Ended
Dec. 31, 2012
Operating Segments [Abstract]  
Schedule of Segment Reporting Information, by Segment
  Three Months Ended December 31, 2012
         Commercial &      
   Communications Residential Industrial Corporate Total
Revenues $ 40,119 $ 36,005 $ 51,140 $ - $ 127,264
Cost of services   32,887   29,899   46,498   -   109,284
Gross profit   7,232   6,106   4,642   -   17,980
Selling, general and administrative   3,558   5,228   3,736   2,400   14,922
Loss (gain) on sale of assets   1   (9)   (11)   -   (19)
Income (loss) from operations $ 3,673 $ 887 $ 917 $ (2,400) $ 3,077
Other data:               
 Depreciation and amortization expense $ 87 $ 95 $ 57 $ 300 $ 539
 Capital expenditures   41   26   13   -   80
 Total assets $ 34,072 $ 31,914 $ 54,436 $ 44,736 $ 165,158
                 

  Three Months Ended December 31, 2011
         Commercial &      
   Communications Residential Industrial Corporate Total
Revenues $ 25,162 $ 29,272 $ 54,564 $ - $ 108,998
Cost of services   21,597   24,626   49,582   -   95,805
Gross profit   3,565   4,646   4,982   -   13,193
Selling, general and administrative   2,710   4,414   4,071   1,460   12,655
Loss (gain) on sale of assets   (61)   4   (80)   -   (137)
Income (loss) from operations $ 916 $ 228 $ 991 $ (1,460) $ 675
Other data:               
 Depreciation and amortization expense $ 52 $ 82 $ 79 $ 287 $ 500
 Capital expenditures $ 42 $ 260 $ - $ 861 $ 1,163
 Total assets $ 17,899 $ 23,095 $ 73,383 $ 47,585 $ 161,962