SEGMENT REPORTING (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2024 USD ($) item	Jan. 31, 2023 USD ($)	Jan. 31, 2022 USD ($)
Segment Reporting Information
Operating segment | item	1
Revenues	$ 573,333	$ 455,040	$ 509,370
Cost of revenues	492,499	368,679	409,638
Gross profit	80,834	86,361	99,732
Selling, general and administrative expenses	44,376	44,692	47,321
Impairment loss			7,901
Income (loss) from operations	36,458	41,669	44,510
Other income (loss), net	12,475	4,331	2,552
Income (loss) before income taxes	48,933	46,000	47,062
Income tax expense	16,575	11,296	11,356
NET INCOME	32,358	34,704	35,706
Amortization of intangibles	392	732	870
Depreciation	2,013	2,983	3,367
Property, plant and equipment additions	2,756	3,372	1,422
Current assets	547,179	438,702	507,284
Current liabilities	302,260	202,503	223,027
Goodwill	28,033	28,033	28,033
Total assets	598,229	489,487	553,585
Intercompany Eliminations
Segment Reporting Information
Revenues	0	600	2,800
Corporate, Non-Segment [Member]
Segment Reporting Information
Selling, general and administrative expenses	11,193	10,804	8,685
Income (loss) from operations	(11,193)	(10,804)	(8,685)
Other income (loss), net	(1,393)	499	7
Income (loss) before income taxes	(12,586)	(10,305)	(8,678)
Depreciation	4	4	4
Property, plant and equipment additions	3	16	5
Current assets	100,676	84,572	156,198
Current liabilities	1,825	1,472	1,748
Total assets	103,943	87,703	156,886
Power Industry Services
Segment Reporting Information
Goodwill	18,476	18,476	18,476
Power Industry Services | Operating Segments
Segment Reporting Information
Revenues	416,281	346,033	398,089
Cost of revenues	357,705	277,402	317,130
Gross profit	58,576	68,631	80,959
Selling, general and administrative expenses	24,274	22,635	28,323
Impairment loss			7,901
Income (loss) from operations	34,302	45,996	44,735
Other income (loss), net	13,871	3,829	2,545
Income (loss) before income taxes	48,173	49,825	47,280
Amortization of intangibles			208
Depreciation	527	567	605
Property, plant and equipment additions	1,266	1,450	713
Current assets	383,508	307,742	322,448
Current liabilities	256,975	170,164	209,829
Goodwill	18,476	18,476	18,476
Total assets	411,571	334,593	345,956
Industrial Services
Segment Reporting Information
Goodwill	9,467	9,467	9,467
Industrial Services | Operating Segments
Segment Reporting Information
Revenues	142,801	92,774	97,890
Cost of revenues	124,321	78,034	81,391
Gross profit	18,480	14,740	16,499
Selling, general and administrative expenses	6,440	7,900	8,167
Income (loss) from operations	12,040	6,840	8,332
Income (loss) before income taxes	12,040	6,840	8,332
Amortization of intangibles	392	618	662
Depreciation	1,073	1,978	2,325
Property, plant and equipment additions	1,014	1,717	107
Current assets	59,123	42,488	25,681
Current liabilities	41,869	29,550	9,534
Goodwill	9,467	9,467	9,467
Total assets	76,012	60,038	44,002
Telecommunications Infrastructure Services
Segment Reporting Information
Goodwill	90	90	90
Telecommunications Infrastructure Services | Operating Segments
Segment Reporting Information
Revenues	14,251	16,233	13,391
Cost of revenues	10,473	13,243	11,117
Gross profit	3,778	2,990	2,274
Selling, general and administrative expenses	2,469	3,353	2,146
Income (loss) from operations	1,309	(363)	128
Other income (loss), net	(3)	3
Income (loss) before income taxes	1,306	(360)	128
Amortization of intangibles		114
Depreciation	409	434	433
Property, plant and equipment additions	473	189	597
Current assets	3,872	3,900	2,957
Current liabilities	1,591	1,317	1,916
Goodwill	90	90	90
Total assets	$ 6,703	$ 7,153	$ 6,741