SEGMENT REPORTING (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2022 USD ($) item	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)
Segment Reporting Information
Operating segment | item	1
Revenues	$ 509,370	$ 392,206	$ 238,997
Cost of revenues	409,638	330,139	245,817
Gross profit	99,732	62,067	(6,820)
Selling, general and administrative expenses	47,321	39,041	44,125
Impairment loss	7,901		4,895
Income (loss) from operations	44,510	23,026	(55,840)
Other (loss) income, net	2,552	1,859	8,075
Income (loss) before income taxes	47,062	24,885	(47,765)
Income tax (expense) benefit	(11,356)	(1,074)	7,053
Net income (loss)	35,706	23,811	(40,712)
Amortization of intangibles	870	904	1,136
Depreciation	3,367	3,715	3,513
Property, plant and equipment additions	1,422	1,697	7,058
Current assets	507,284	546,220	421,755
Current liabilities	223,027	276,087	144,034
Goodwill	28,033	27,943	27,943	$ 32,838
Total assets	553,585	602,630	487,540
Other [Member]
Segment Reporting Information
Selling, general and administrative expenses	8,685	7,901	7,345
Income (loss) from operations	(8,685)	(7,901)	(7,345)
Other (loss) income, net	7	82	540
Income (loss) before income taxes	(8,678)	(7,819)	(6,805)
Depreciation	4	5	5
Property, plant and equipment additions	5		11
Current assets	156,198	161,695	76,794
Current liabilities	1,748	985	1,279
Total assets	156,886	162,212	84,636
Intercompany Eliminations
Segment Reporting Information
Revenues	2,800	4,300	3,300
Power Industry Services [Member]
Segment Reporting Information
Revenues	398,089	319,353	135,729
Cost of revenues	317,130	266,993	152,854
Gross profit	80,959	52,360	(17,125)
Selling, general and administrative expenses	28,323	21,795	26,835
Impairment loss	7,901		2,072
Income (loss) from operations	44,735	30,565	(46,032)
Other (loss) income, net	2,545	1,777	7,535
Income (loss) before income taxes	47,280	32,342	(38,497)
Amortization of intangibles	208	242	291
Depreciation	605	704	694
Property, plant and equipment additions	713	1,043	5,069
Current assets	322,448	360,552	320,257
Current liabilities	209,829	261,030	135,518
Goodwill	18,476	18,476	18,476
Total assets	345,956	394,014	352,034
Industrial Services
Segment Reporting Information
Revenues	97,890	65,263	94,682
Cost of revenues	81,391	57,257	85,859
Gross profit	16,499	8,006	8,823
Selling, general and administrative expenses	8,167	7,358	7,810
Impairment loss			2,823
Income (loss) from operations	8,332	648	(1,810)
Income (loss) before income taxes	8,332	648	(1,810)
Amortization of intangibles	662	662	664
Depreciation	2,325	2,592	2,418
Property, plant and equipment additions	107	338	1,638
Current assets	25,681	22,014	21,766
Current liabilities	9,534	13,119	6,441
Goodwill	9,467	9,467	9,467
Total assets	44,002	42,998	46,321
Telecommunications Infrastructure Services [Member]
Segment Reporting Information
Revenues	13,391	7,590	8,586
Cost of revenues	11,117	5,889	7,104
Gross profit	2,274	1,701	1,482
Selling, general and administrative expenses	2,146	1,987	2,135
Income (loss) from operations	128	(286)	(653)
Income (loss) before income taxes	128	(286)	(653)
Amortization of intangibles			181
Depreciation	433	414	396
Property, plant and equipment additions	597	316	340
Current assets	2,957	1,959	2,938
Current liabilities	1,916	953	796
Goodwill	90
Total assets	$ 6,741	$ 3,406	$ 4,549