INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
INCOME TAXES
Federal corporate income tax rate (as percent)	21.00%	21.00%	21.00%
Computed expected income tax expense	$ 9,660	$ 9,883	$ 5,226
State income taxes, net of federal tax effect	860	614	7
Research and development credits adjustment (see discussion below)	6,181
Recognition of research and development credit benefits (see discussion below)	(3,430)
Recognition of foreign net operating loss benefits (see discussion below)	(2,574)
Excess executive compensation	1,397	1,296	420
Bad debt loss	(167)	425	(160)
Foreign tax rate differential	(441)	(352)	(173)
Net operating loss carryback benefit (see discussion below)			(4,392)
Other permanent differences and adjustments, net	(190)	(510)	146
Income tax expense	11,296	11,356	1,074
Net operating loss carryback benefit		4,400
Deferred tax valuation allowance	9,740	12,404
Foreign income tax expense	740		151
Deferred tax assets	7,900
Contract Assets	4,400
Development Tax Credit	2,400
Uncertain Income Tax Return	2,900	$ 4,900	$ 4,900
Increase in deferred tax valuation allowance	$ 2,600