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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 |

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