CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 34,704	$ 35,706	$ 23,811
Adjustments to reconcile net income to net cash (used in) provided by operating activities
Stock compensation expense	3,958	3,459	2,938
Depreciation	2,983	3,367	3,715
Deferred income tax (benefit) expense	(3,232)	(208)	7,645
Lease expense	2,554	3,391	1,820
Changes in accrued interest on short-term investments	(1,735)	29	444
Equity in (income) loss of solar energy investments	(1,113)	466
Amortization of purchased intangible assets	732	870	904
Provisions for credit losses	92	2,381	16
Impairment loss		7,901
Other	7	(71)	181
Changes in operating assets and liabilities
Accounts receivable	(23,246)	(480)	8,463
Contract assets	(19,874)	21,741	6,744
Other assets	(3,346)	(241)	(11,467)
Accounts payable and accrued expenses	9,084	(5,742)	31,442
Contract liabilities	(31,629)	(44,154)	99,357
Net cash (used in) provided by operating activities	(30,061)	28,415	176,013
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(249,750)	(90,000)	(100,000)
Maturities of short-term investments	190,000	90,000	170,000
Purchases of property, plant and equipment	(3,372)	(1,422)	(1,697)
Investments in solar energy projects		(5,016)	(1,333)
Acquisition of Lee Telecom, Inc.		(600)
Net cash (used in) provided by investing activities	(63,122)	(7,038)	66,970
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(68,236)	(20,372)
Payments of cash dividends	(13,956)	(15,664)	(47,047)
Distribution to non-controlling interest	(677)
Proceeds from the exercise of stock options	66	1,428	1,641
Net cash used in financing activities	(82,803)	(34,608)	(45,406)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(539)	(2,968)	1,731
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(176,525)	(16,199)	199,308
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	350,472	366,671	167,363
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 173,947	$ 350,472	$ 366,671