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Segment Reporting (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 | Jul. 31, 2012 | Jan. 31, 2013
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |  |  |  |
Net revenues | $ 57,864,000 | $ 82,619,000 | $ 104,512,000 | $ 146,309,000 |
Cost of revenues | 36,607,000 | 69,740,000 | 70,227,000 | 123,329,000 |
Gross profit | 21,257,000 | 12,879,000 | 34,285,000 | 22,980,000 |
Selling, general and administrative expenses | 1,601,000 | 3,297,000 | 5,044,000 | 6,325,000 |
Income (loss) from operations | 19,656,000 | 9,582,000 | 29,241,000 | 16,655,000 |
Gains on the deconsolidation of VIEs | 1,324,000 |  | 2,444,000 |  |
Other income (expense), net | 410,000 | (10,000) | 566,000 | (19,000) |
Income (loss) from continuing operations before income taxes | 21,390,000 | 9,572,000 | 32,251,000 | 16,636,000 |
Income tax expense | 7,467,000 | 3,591,000 | 11,388,000 | 6,108,000 |
Income from continuing operations | 13,923,000 | 5,981,000 | 20,863,000 | 10,528,000 |
Amortization of purchased intangibles | 61,000 | 61,000 | 121,000 | 121,000 |
Depreciation | 136,000 | 132,000 | 265,000 | 249,000 |
Property, plant and equipment additions | 174,000 | 2,627,000 | 851,000 | 3,791,000 |
Goodwill | 18,476,000 | 18,476,000 | 18,476,000 | 18,476,000 | 18,476,000
Total assets | 206,748,000 | 245,463,000 | 206,748,000 | 245,463,000 | 234,724,000
Power Industry Services [Member] |  |  |  |  |
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |  |  |  |
Net revenues | 55,520,000 | 78,109,000 | 99,289,000 | 135,837,000 |
Cost of revenues | 34,804,000 | 66,182,000 | 66,050,000 | 115,166,000 |
Gross profit | 20,716,000 | 11,927,000 | 33,239,000 | 20,671,000 |
Selling, general and administrative expenses | 1,626,000 | 1,932,000 | 3,441,000 | 3,491,000 |
Income (loss) from operations | 19,090,000 | 9,995,000 | 29,798,000 | 17,180,000 |
Gains on the deconsolidation of VIEs | 1,324,000 |  | 2,444,000 |  |
Other income (expense), net | 409,000 | (11,000) | 564,000 | (20,000) |
Income (loss) from continuing operations before income taxes | 20,823,000 | 9,984,000 | 32,806,000 | 17,160,000 |
Amortization of purchased intangibles | 61,000 | 61,000 | 121,000 | 121,000 |
Depreciation | 89,000 | 69,000 | 172,000 | 127,000 |
Property, plant and equipment additions | 141,000 | 2,591,000 | 807,000 | 3,617,000 |
Goodwill | 18,476,000 | 18,476,000 | 18,476,000 | 18,476,000 |
Total assets | 150,254,000 | 195,250,000 | 150,254,000 | 195,250,000 |
Telecommunications Infrastructure Services [Member] |  |  |  |  |
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |  |  |  |
Net revenues | 2,344,000 | 4,510,000 | 5,223,000 | 10,472,000 |
Cost of revenues | 1,803,000 | 3,558,000 | 4,177,000 | 8,163,000 |
Gross profit | 541,000 | 952,000 | 1,046,000 | 2,309,000 |
Selling, general and administrative expenses | 330,000 | 441,000 | 646,000 | 881,000 |
Income (loss) from operations | 211,000 | 511,000 | 400,000 | 1,428,000 |
Income (loss) from continuing operations before income taxes | 211,000 | 511,000 | 400,000 | 1,428,000 |
Depreciation | 46,000 | 62,000 | 91,000 | 120,000 |
Property, plant and equipment additions | 33,000 | 36,000 | 44,000 | 174,000 |
Total assets | 2,718,000 | 4,117,000 | 2,718,000 | 4,117,000 |
Other [Member] |  |  |  |  |
Summarized operating results and certain financial position data of Company's reportable continuing business segments |  |  |  |  |
Selling, general and administrative expenses | (355,000) | 924,000 | 957,000 | 1,953,000 |
Income (loss) from operations | 355,000 | (924,000) | (957,000) | (1,953,000) |
Other income (expense), net | 1,000 | 1,000 | 2,000 | 1,000 |
Income (loss) from continuing operations before income taxes | 356,000 | (923,000) | (955,000) | (1,952,000) |
Depreciation | 1,000 | 1,000 | 2,000 | 2,000 |
Total assets | $ 53,776,000 | $ 46,096,000 | $ 53,776,000 | $ 46,096,000 |

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