CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
CURRENT ASSETS
Cash and cash equivalents	$ 391,563	$ 366,671
Short-term investments	90,001	90,055
Accounts receivable	35,793	28,713
Contract assets	9,908	26,635
Other current assets (Note 10)	32,454	34,146
TOTAL CURRENT ASSETS	559,719	546,220
Property, plant and equipment, net	18,385	20,361
Goodwill	27,943	27,943
Other purchased intangible assets, net	3,417	4,097
Deferred taxes		249
Right-of-use and other assets	3,689	3,760
TOTAL ASSETS	613,153	602,630
CURRENT LIABILITIES
Accounts payable	39,959	53,295
Accrued expenses	42,672	50,750
Contract liabilities	176,414	172,042
TOTAL CURRENT LIABILITIES	259,045	276,087
Deferred taxes	133
Other noncurrent liabilities	4,180	4,135
TOTAL LIABILITIES	263,358	280,222
COMMITMENTS AND CONTINGENCIES (Notes 7 and 8)
STOCKHOLDERS' EQUITY
Preferred stock, par value $0.10 per share - 500,000 shares authorized; no shares issued and outstanding
Common stock, par value $0.15 per share - 30,000,000 shares authorized; 15,787,673 and 15,706,202 shares issued at October 31, 2021 and January 31, 2021, respectively; 15,784,440 and 15,702,969 shares outstanding at October 31, 2021 and January 31, 2021, respectively	2,368	2,356
Additional paid-in capital	157,187	153,282
Retained earnings	190,308	166,110
Accumulated other comprehensive loss	(1,809)	(1,081)
TOTAL STOCKHOLDERS' EQUITY	348,054	320,667
Non-controlling interests	1,741	1,741
TOTAL EQUITY	349,795	322,408
TOTAL LIABILITIES AND EQUITY	$ 613,153	$ 602,630