CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 7,882	$ 2,109
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Changes in accrued interest on investments	3,544	1,081
Stock compensation expense	1,211	1,034
Lease expense	647	439
Depreciation	480	547
Deferred income tax expense	263	147
Amortization of intangible assets	97	98
Other	(38)	57
Changes in operating assets and liabilities
Accounts receivable	(12,636)	(10,642)
Contract assets	(6,196)	19,864
Other assets	(4,422)	(4,089)
Accounts payable and accrued expenses	7,479	(26,940)
Contract liabilities	19,375	15,047
Net cash provided by (used in) operating activities	17,686	(1,248)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(57,500)	(90,000)
Maturities of short-term investments	80,000	149,750
Purchases of available-for-sale securities	(29,824)	(30,355)
Maturities of available-for-sale securities	9,230
Purchases of property, plant and equipment	(322)	(645)
Investments in solar energy projects	(3,312)
Net cash (used in) provided by investing activities	(1,728)	28,750
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(187)	(3,681)
Payments of cash dividends	(4,025)	(3,357)
Proceeds from share-based award settlements, net of withholding taxes paid	(906)	544
Net cash used in financing activities	(5,118)	(6,494)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(134)	992
NET INCREASE IN CASH AND CASH EQUIVALENTS	10,706	22,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	197,032	173,947
CASH AND CASH EQUIVALENTS, END OF PERIOD	207,738	195,947
NON-CASH INVESTING AND FINANCING ACTIVITIES
Right-of-use assets obtained in exchange for lease obligations	542	293
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes, net of refunds	3,312	513
Cash paid for operating leases	$ 651	$ 444