PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2022	Jan. 31, 2022	Jul. 31, 2021
Indefinite-Lived Intangible Assets
Goodwill	$ 28,033	$ 28,033	$ 27,943
Intangible Assets - Gross Carrying Amount	7,426
Accumulated Amortization	4,485
Intangible Assets, Net (Excluding Goodwill)	2,941	3,322
TRC.
Indefinite-Lived Intangible Assets
Goodwill		9,500
GPS.
Indefinite-Lived Intangible Assets
Goodwill	$ 18,500
Trade Name
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	15 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 4,499
Accumulated Amortization	2,000
Finite Lived Intangible Assets - Net Amount	$ 2,499	2,650
Process certifications
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	7 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 1,897
Accumulated Amortization	1,807
Finite Lived Intangible Assets - Net Amount	$ 90	226
Customer relationships
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	10 years
Finite Lived Intangible Assets - Gross Carrying Amount	$ 916
Accumulated Amortization	610
Finite Lived Intangible Assets - Net Amount	306	351
Customer Contracts
Indefinite-Lived Intangible Assets
Intangible Assets - Gross Carrying Amount	114
Accumulated Amortization	68
Finite Lived Intangible Assets - Net Amount	$ 46	$ 95
Customer Contracts | Maximum
Indefinite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life	1 year