SEGMENT REPORTING (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2023 USD ($) item	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)
Segment Reporting Information
Operating segment | item	1
Revenues	$ 455,040	$ 509,370	$ 392,206
Cost of revenues	368,679	409,638	330,139
Gross profit	86,361	99,732	62,067
Selling, general and administrative expenses	44,692	47,321	39,041
Impairment loss		7,901
Income (loss) from operations	41,669	44,510	23,026
Other income, net	4,331	2,552	1,859
Income (loss) before income taxes	46,000	47,062	24,885
Income tax expense	(11,296)	(11,356)	(1,074)
Net income	34,704	35,706	23,811
Amortization of intangibles	732	870	904
Depreciation	2,983	3,367	3,715
Property, plant and equipment additions	3,372	1,422	1,697
Current assets	438,702	507,284	546,220
Current liabilities	202,503	223,027	276,087
Goodwill	28,033	28,033	27,943
Total assets	489,487	553,585	602,630
Other [Member]
Segment Reporting Information
Selling, general and administrative expenses	10,804	8,685	7,901
Income (loss) from operations	(10,804)	(8,685)	(7,901)
Other income, net	499	7	82
Income (loss) before income taxes	(10,305)	(8,678)	(7,819)
Depreciation	4	4	5
Property, plant and equipment additions	16	5
Current assets	84,572	156,198	161,695
Current liabilities	1,472	1,748	985
Total assets	87,703	156,886	162,212
Intercompany Eliminations
Segment Reporting Information
Revenues	600	2,800	4,300
Power Industry Services [Member]
Segment Reporting Information
Revenues	346,033	398,089	319,353
Cost of revenues	277,402	317,130	266,993
Gross profit	68,631	80,959	52,360
Selling, general and administrative expenses	22,635	28,323	21,795
Impairment loss		7,901
Income (loss) from operations	45,996	44,735	30,565
Other income, net	3,829	2,545	1,777
Income (loss) before income taxes	49,825	47,280	32,342
Amortization of intangibles		208	242
Depreciation	567	605	704
Property, plant and equipment additions	1,450	713	1,043
Current assets	307,742	322,448	360,552
Current liabilities	170,164	209,829	261,030
Goodwill	18,476	18,476	18,476
Total assets	334,593	345,956	394,014
Industrial Services
Segment Reporting Information
Revenues	92,774	97,890	65,263
Cost of revenues	78,034	81,391	57,257
Gross profit	14,740	16,499	8,006
Selling, general and administrative expenses	7,900	8,167	7,358
Income (loss) from operations	6,840	8,332	648
Income (loss) before income taxes	6,840	8,332	648
Amortization of intangibles	618	662	662
Depreciation	1,978	2,325	2,592
Property, plant and equipment additions	1,717	107	338
Current assets	42,488	25,681	22,014
Current liabilities	29,550	9,534	13,119
Goodwill	9,467	9,467	9,467
Total assets	60,038	44,002	42,998
Telecommunications Infrastructure Services [Member]
Segment Reporting Information
Revenues	16,233	13,391	7,590
Cost of revenues	13,243	11,117	5,889
Gross profit	2,990	2,274	1,701
Selling, general and administrative expenses	3,353	2,146	1,987
Income (loss) from operations	(363)	128	(286)
Other income, net	3
Income (loss) before income taxes	(360)	128	(286)
Amortization of intangibles	114
Depreciation	434	433	414
Property, plant and equipment additions	189	597	316
Current assets	3,900	2,957	1,959
Current liabilities	1,317	1,916	953
Goodwill	90	90
Total assets	$ 7,153	$ 6,741	$ 3,406