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SEGMENT REPORTING - Summarized Operating Results and Certain Financial Position Data of Company's Reportable Business Segments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Jan. 31, 2015
Segment Reporting Information [Line Items]          
Revenues $ 113,967,000 $ 127,564,000 $ 296,888,000 $ 280,785,000  
Cost of revenues 87,705,000 97,251,000 220,966,000 218,858,000  
Gross profit 26,262,000 30,313,000 75,922,000 61,927,000  
Selling, general and administrative expenses 5,590,000 5,473,000 15,977,000 13,332,000  
Income (loss) from operations 20,672,000 24,840,000 59,945,000 48,595,000  
Other income, net 732,000 99,000 944,000 162,000  
INCOME BEFORE INCOME TAXES 21,404,000 24,939,000 60,889,000 48,757,000  
Income tax expense 7,045,000 8,180,000 19,845,000 15,177,000  
Net income 14,359,000 16,759,000 41,044,000 33,580,000  
Amortization of purchased intangibles 119,000 61,000 283,000 182,000  
Depreciation 186,000 140,000 444,000 423,000  
Property, plant and equipment additions 158,000 1,643,000 2,671,000 1,842,000  
Goodwill 22,525,000 18,476,000 22,525,000 18,476,000 $ 18,476,000
Total assets 365,263,000 414,378,000 365,263,000 414,378,000 $ 391,193,000
Power Industry Services [Member]          
Segment Reporting Information [Line Items]          
Revenues 111,592,000 125,660,000 287,947,000 275,902,000  
Cost of revenues 86,103,000 95,863,000 214,618,000 215,174,000  
Gross profit 25,489,000 29,797,000 73,329,000 60,728,000  
Selling, general and administrative expenses 3,240,000 3,486,000 9,671,000 8,042,000  
Income (loss) from operations 22,249,000 26,311,000 63,658,000 52,686,000  
Other income, net 304,000 98,000 683,000 160,000  
INCOME BEFORE INCOME TAXES 22,553,000 26,409,000 64,341,000 52,846,000  
Amortization of purchased intangibles 119,000 61,000 283,000 182,000  
Depreciation 143,000 94,000 312,000 286,000  
Property, plant and equipment additions 146,000 1,629,000 2,566,000 1,718,000  
Goodwill 22,525,000 18,476,000 22,525,000 18,476,000  
Total assets 288,988,000 350,289,000 288,988,000 350,289,000  
Telecommunications Infrastructure Services [Member]          
Segment Reporting Information [Line Items]          
Revenues 2,375,000 1,904,000 8,941,000 4,883,000  
Cost of revenues 1,602,000 1,388,000 6,348,000 3,684,000  
Gross profit 773,000 516,000 2,593,000 1,199,000  
Selling, general and administrative expenses 303,000 311,000 1,022,000 971,000  
Income (loss) from operations 470,000 205,000 1,571,000 228,000  
INCOME BEFORE INCOME TAXES 470,000 205,000 1,571,000 228,000  
Depreciation 40,000 43,000 123,000 129,000  
Property, plant and equipment additions 9,000 14,000 100,000 74,000  
Total assets 2,694,000 2,833,000 2,694,000 2,833,000  
Other [Member]          
Segment Reporting Information [Line Items]          
Selling, general and administrative expenses 2,047,000 1,676,000 5,284,000 4,319,000  
Income (loss) from operations (2,047,000) (1,676,000) (5,284,000) (4,319,000)  
Other income, net 428,000 1,000 261,000 2,000  
INCOME BEFORE INCOME TAXES (1,619,000) (1,675,000) (5,023,000) (4,317,000)  
Depreciation 3,000 3,000 9,000 8,000  
Property, plant and equipment additions 3,000   5,000 50,000  
Total assets $ 73,581,000 $ 61,256,000 $ 73,581,000 $ 61,256,000