SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2023 USD ($) segment	Oct. 31, 2022 USD ($)	Jan. 31, 2023 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 163,755	$ 117,875	$ 408,779	$ 336,262
Cost of revenues	144,520	95,667	351,578	269,929
Gross profit	19,235	22,208	57,201	66,333
Selling, general and administrative expenses	11,375	12,667	32,467	34,226
Income (loss) from operations	7,860	9,541	24,734	32,107
Other income (loss), net	3,733	768	7,222	1,868
Income (loss) before income taxes	11,593	10,309	31,956	33,975
Income tax expense	6,129	2,551	11,616	14,510
Net income	5,464	7,758	20,340	19,465
Amortization of intangibles	98	212	294	611
Depreciation	489	740	1,524	2,296
Property, plant and equipment additions	1,112	1,944	2,143	2,582
Current assets	514,071	364,965	514,071	364,965	$ 438,702
Current liabilities	273,894	134,542	273,894	134,542	202,503
Goodwill	28,033	28,033	28,033	28,033	28,033
Total assets	563,652	410,903	563,652	410,903	$ 489,487
Other
Segment Reporting Information
Selling, general and administrative expenses	2,751	3,303	8,197	8,172
Income (loss) from operations	(2,751)	(3,303)	(8,197)	(8,172)
Other income (loss), net	342	176	(1,863)	254
Income (loss) before income taxes	(2,409)	(3,127)	(10,060)	(7,918)
Depreciation	1	1	3	3
Property, plant and equipment additions	1	4	1	4
Current assets	71,038	91,959	71,038	91,959
Current liabilities	1,592	1,179	1,592	1,179
Total assets	73,555	92,709	73,555	92,709
Power Industry Services | Operating Segments
Segment Reporting Information
Revenues	121,300	90,682	296,821	255,958
Cost of revenues	107,781	72,725	255,210	202,985
Gross profit	13,519	17,957	41,611	52,973
Selling, general and administrative expenses	6,390	6,745	17,700	18,418
Income (loss) from operations	7,129	11,212	23,911	34,555
Other income (loss), net	3,391	592	9,088	1,613
Income (loss) before income taxes	10,520	11,804	32,999	36,168
Depreciation	137	142	393	422
Property, plant and equipment additions	583	774	1,120	868
Current assets	399,489	237,575	399,489	237,575
Current liabilities	244,662	110,383	244,662	110,383
Goodwill	18,476	18,476	18,476	18,476
Total assets	426,466	261,994	426,466	261,994
Industrial Construction Services | Operating Segments
Segment Reporting Information
Revenues	38,434	22,137	101,497	67,660
Cost of revenues	33,899	18,737	88,537	56,968
Gross profit	4,535	3,400	12,960	10,692
Selling, general and administrative expenses	1,626	1,823	4,532	5,267
Income (loss) from operations	2,909	1,577	8,428	5,425
Income (loss) before income taxes	2,909	1,577	8,428	5,425
Amortization of intangibles	98	166	294	497
Depreciation	249	501	813	1,553
Property, plant and equipment additions	497	928	973	1,415
Current assets	39,843	31,355	39,843	31,355
Current liabilities	25,839	21,560	25,839	21,560
Goodwill	9,467	9,467	9,467	9,467
Total assets	57,112	48,766	57,112	48,766
Telecommunications Infrastructure Services | Operating Segments
Segment Reporting Information
Revenues	4,021	5,056	10,461	12,644
Cost of revenues	2,840	4,205	7,831	9,976
Gross profit	1,181	851	2,630	2,668
Selling, general and administrative expenses	608	796	2,038	2,369
Income (loss) from operations	573	55	592	299
Other income (loss), net			(3)	1
Income (loss) before income taxes	573	55	589	300
Amortization of intangibles		46		114
Depreciation	102	96	315	318
Property, plant and equipment additions	31	238	49	295
Current assets	3,701	4,076	3,701	4,076
Current liabilities	1,801	1,420	1,801	1,420
Goodwill	90	90	90	90
Total assets	$ 6,519	$ 7,434	$ 6,519	$ 7,434