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Segment Reporting (Details) (USD $)
 3 Months Ended 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Jan. 31, 2012
Summarized operating results and certain financial position data of Company's reportable continuing business segments          
Net revenues $ 82,619,000 $ 26,342,000 $ 146,309,000 $ 42,335,000  
Cost of revenues 69,740,000 21,695,000 123,329,000 33,790,000  
Gross profit 12,879,000 4,647,000 22,980,000 8,545,000  
Selling, general and administrative expenses 3,297,000 2,374,000 6,325,000 5,133,000  
Income from operations 9,582,000 2,273,000 16,655,000 3,412,000  
Other (expense) income, net (10,000) 29,000 (19,000) 51,000  
Income from continuing operations before income taxes 9,572,000 2,302,000 16,636,000 3,463,000  
Income tax expense 3,591,000 782,000 6,108,000 1,198,000  
Income from continuing operations 5,981,000 1,520,000 10,528,000 2,265,000  
Amortization of purchased intangibles 61,000 87,000 121,000 175,000  
Depreciation 132,000 114,000 249,000 231,000  
Fixed asset additions 2,627,000 50,000 3,791,000 59,000  
Goodwill 18,476,000 18,476,000 18,476,000 18,476,000 18,476,000
Total assets 245,463,000 145,626,000 245,463,000 145,626,000 205,252,000
Power Industry Services [Member]
          
Summarized operating results and certain financial position data of Company's reportable continuing business segments          
Other (expense) income, net (11,000) 24,000 (20,000) 39,000  
Amortization of purchased intangibles 61,000 87,000 121,000 175,000  
Depreciation 69,000 51,000 127,000 100,000  
Fixed asset additions 2,591,000   3,617,000    
Goodwill 18,476,000 18,476,000 18,476,000 18,476,000  
Total assets 195,250,000 89,295,000 195,250,000 89,295,000  
Telecommunications Infrastructure Services [Member]
          
Summarized operating results and certain financial position data of Company's reportable continuing business segments          
Depreciation 62,000 62,000 120,000 129,000  
Fixed asset additions 36,000 50,000 174,000 55,000  
Total assets 4,117,000 2,798,000 4,117,000 2,798,000  
Other [Member]
          
Summarized operating results and certain financial position data of Company's reportable continuing business segments          
Selling, general and administrative expenses 924,000 703,000 1,953,000 1,652,000  
Income from operations (924,000) (703,000) (1,953,000) (1,652,000)  
Other (expense) income, net 1,000 5,000   12,000  
Income from continuing operations before income taxes (923,000) (698,000) (1,952,000) (1,640,000)  
Depreciation 1,000 1,000 2,000 2,000  
Fixed asset additions       4,000  
Total assets $ 46,096,000 $ 53,533,000 $ 46,096,000 $ 53,533,000