SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Oct. 31, 2022 USD ($) segment	Oct. 31, 2021 USD ($)	Jan. 31, 2022 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 117,875	$ 124,451	$ 336,262	$ 383,800
Cost of revenues	95,667	98,316	269,929	306,299
Gross profit	22,208	26,135	66,333	77,501
Selling, general and administrative expenses	12,667	11,590	34,226	31,813
Income (loss) from operations	9,541	14,545	32,107	45,688
Other income, net	768	1,117	1,868	1,569
Income (loss) before income taxes	10,309	15,662	33,975	47,257
Income tax expense	(2,551)	(3,269)	(14,510)	(11,228)
Net income	7,758	12,393	19,465	36,029
Amortization of intangibles	212	227	611	680
Depreciation	740	819	2,296	2,560
Property, plant and equipment additions	1,944	321	2,582	1,123
Current assets	364,965	559,719	364,965	559,719	$ 507,284
Current liabilities	134,542	259,045	134,542	259,045	223,027
Goodwill	28,033	27,943	28,033	27,943	28,033
Total assets	410,903	613,153	410,903	613,153	$ 553,585
Other [Member]
Segment Reporting Information
Selling, general and administrative expenses	3,303	2,104	8,172	6,292
Income (loss) from operations	(3,303)	(2,104)	(8,172)	(6,292)
Other income, net	176	1	254	5
Income (loss) before income taxes	(3,127)	(2,103)	(7,918)	(6,287)
Depreciation	1	1	3	3
Property, plant and equipment additions	4	2	4	5
Current assets	91,959	157,991	91,959	157,991
Current liabilities	1,179	641	1,179	641
Total assets	92,709	158,294	92,709	158,294
Intercompany Eliminations
Segment Reporting Information
Revenues	300		600	2,700
Power Industry Services [Member]
Segment Reporting Information
Revenues	90,682	99,560	255,958	295,736
Cost of revenues	72,725	76,517	202,985	233,682
Gross profit	17,957	23,043	52,973	62,054
Selling, general and administrative expenses	6,745	6,770	18,418	17,976
Income (loss) from operations	11,212	16,273	34,555	44,078
Other income, net	592	1,116	1,613	1,564
Income (loss) before income taxes	11,804	17,389	36,168	45,642
Amortization of intangibles		61		183
Depreciation	142	145	422	464
Property, plant and equipment additions	774	36	868	464
Current assets	237,575	374,370	237,575	374,370
Current liabilities	110,383	247,693	110,383	247,693
Goodwill	18,476	18,476	18,476	18,476
Total assets	261,994	406,261	261,994	406,261
Industrial Services
Segment Reporting Information
Revenues	22,137	21,402	67,660	78,213
Cost of revenues	18,737	18,703	56,968	64,519
Gross profit	3,400	2,699	10,692	13,694
Selling, general and administrative expenses	1,823	2,158	5,267	6,017
Income (loss) from operations	1,577	541	5,425	7,677
Income (loss) before income taxes	1,577	541	5,425	7,677
Amortization of intangibles	166	166	497	497
Depreciation	501	564	1,553	1,764
Property, plant and equipment additions	928	60	1,415	76
Current assets	31,355	24,029	31,355	24,029
Current liabilities	21,560	9,015	21,560	9,015
Goodwill	9,467	9,467	9,467	9,467
Total assets	48,766	42,833	48,766	42,833
Telecommunications Infrastructure Services [Member]
Segment Reporting Information
Revenues	5,056	3,489	12,644	9,851
Cost of revenues	4,205	3,096	9,976	8,098
Gross profit	851	393	2,668	1,753
Selling, general and administrative expenses	796	558	2,369	1,528
Income (loss) from operations	55	(165)	299	225
Other income, net			1
Income (loss) before income taxes	55	(165)	300	225
Amortization of intangibles	46		114
Depreciation	96	109	318	329
Property, plant and equipment additions	238	223	295	578
Current assets	4,076	3,329	4,076	3,329
Current liabilities	1,420	1,696	1,420	1,696
Goodwill	90		90
Total assets	$ 7,434	$ 5,765	$ 7,434	$ 5,765