SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jan. 31, 2019
Segment Reporting Information
Revenues	$ 63,059	$ 136,670	$ 112,603	$ 278,036
Cost of revenues	60,094	105,962	130,664	231,876
Gross (loss) profit	2,965	30,708	(18,061)	46,160
Selling, general and administrative expenses	10,038	10,378	19,626	20,015
Impairment loss			2,072
(Loss) income from operations	(7,073)	20,330	(39,759)	26,145
Other income, net	1,642	2,928	3,894	3,692
(Loss) income before income taxes	(5,431)	23,258	(35,865)	29,837
Income tax benefit (expense)	6,411	(6,314)	6,932	(8,051)
Net income (loss)	980	16,944	(28,933)	21,786
Amortization of purchased intangible assets	293	253	592	506
Depreciation	882	796	1,711	1,567
Property, plant and equipment additions	1,058	1,674	3,043	5,365
Current assets	353,137	453,213	353,137	453,213	$ 416,348
Current liabilities	58,714	139,842	58,714	139,842	81,316
Goodwill	30,766	34,329	30,766	34,329	32,838
Total assets	419,724	513,803	419,724	513,803	$ 476,648
Power Services
Segment Reporting Information
Revenues	27,890	105,051	48,093	227,538
Cost of revenues	28,906	79,162	73,432	187,458
Gross (loss) profit	(1,016)	25,889	(25,339)	40,080
Selling, general and administrative expenses	5,659	6,153	11,305	11,385
Impairment loss			2,072
(Loss) income from operations	(6,675)	19,736	(38,716)	28,695
Other income, net	1,490	1,420	3,590	2,095
(Loss) income before income taxes	(5,185)	21,156	(35,126)	30,790
Amortization of purchased intangible assets	83	88	170	175
Depreciation	173	189	341	365
Property, plant and equipment additions	812	716	1,874	1,542
Current assets	252,367	341,112	252,367	341,112
Current liabilities	45,061	121,620	45,061	121,620
Goodwill	18,476	20,548	18,476	20,548
Total assets	281,535	369,714	281,535	369,714
Industrial Services
Segment Reporting Information
Revenues	33,230	28,037	60,299	44,486
Cost of revenues	29,528	24,037	53,799	39,686
Gross (loss) profit	3,702	4,000	6,500	4,800
Selling, general and administrative expenses	2,080	1,953	3,941	3,788
(Loss) income from operations	1,622	2,047	2,559	1,012
Other income, net		1,400		1,400
(Loss) income before income taxes	1,622	3,447	2,559	2,412
Amortization of purchased intangible assets	165	165	331	331
Depreciation	606	511	1,166	1,024
Property, plant and equipment additions	236	711	1,051	3,275
Current assets	34,822	29,983	34,822	29,983
Current liabilities	12,258	16,378	12,258	16,378
Goodwill	12,290	13,781	12,290	13,781
Total assets	63,393	60,077	63,393	60,077
Telecom Services
Segment Reporting Information
Revenues	1,939	3,582	4,211	6,012
Cost of revenues	1,660	2,763	3,433	4,732
Gross (loss) profit	279	819	778	1,280
Selling, general and administrative expenses	539	388	1,050	850
(Loss) income from operations	(260)	431	(272)	430
(Loss) income before income taxes	(260)	431	(272)	430
Amortization of purchased intangible assets	45		91
Depreciation	101	92	201	171
Property, plant and equipment additions	10	247	107	547
Current assets	1,948	4,041	1,948	4,041
Current liabilities	777	902	777	902
Total assets	3,457	5,676	3,457	5,676
Other
Segment Reporting Information
Selling, general and administrative expenses	1,760	1,884	3,330	3,992
(Loss) income from operations	(1,760)	(1,884)	(3,330)	(3,992)
Other income, net	152	108	304	197
(Loss) income before income taxes	(1,608)	(1,776)	(3,026)	(3,795)
Depreciation	2	4	3	7
Property, plant and equipment additions			11	1
Current assets	64,000	78,077	64,000	78,077
Current liabilities	618	942	618	942
Total assets	71,339	78,336	71,339	78,336
Intercompany Eliminations
Segment Reporting Information
Revenues	$ 900	$ 400	$ 1,400	$ 400