CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 2,109	$ 7,485
Adjustments to reconcile net income to net cash used in operating activities
Changes in accrued interest on investments	1,081	(203)
Stock compensation expense	1,034	920
Depreciation	547	809
Lease expense	439	750
Amortization of intangible assets	98	166
Deferred income tax expense	147	450
Equity in loss (income) of solar energy investments	32	(610)
Other	25	(9)
Changes in operating assets and liabilities
Accounts receivable	(10,642)	(9,069)
Contract assets	19,864	(1,976)
Other assets	(4,089)	(2,291)
Accounts payable and accrued expenses	(26,940)	(15,229)
Contract liabilities	15,047	(20,923)
Net cash used in operating activities	(1,248)	(39,730)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(90,000)	(175,000)
Maturities of short-term investments	149,750	90,000
Purchases of available-for-sale securities	(30,355)
Purchases of property, plant and equipment	(645)	(238)
Net cash provided by (used in) investing activities	28,750	(85,238)
CASH FLOWS FROM FINANCING ACTIVITIES
Common stock repurchases	(3,681)	(27,077)
Payments of cash dividends	(3,357)	(3,712)
Proceeds from the exercise of stock options	544	66
Net cash used in financing activities	(6,494)	(30,723)
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	992	(2,526)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	22,000	(158,217)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	173,947	350,472
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 195,947	$ 192,255