CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 151,523	$ 122,107
Short-term investments	214,058	311,908
Amount retained by project owners	35,623	24,756
Contract assets	50,579	13,847
Prepaid expenses and other current assets	13,849	12,410
TOTAL CURRENT ASSETS	465,632	485,028
Property, plant and equipment, net	18,175	15,299
Goodwill	34,329	34,329
Other intangible assets, net	6,896	7,149
Deferred taxes	435	439
Other assets	411	426
TOTAL ASSETS	525,878	542,670
CURRENT LIABILITIES
Accounts payable	97,453	100,238
Accrued expenses	37,397	35,360
Contract liabilities	30,463	47,613
TOTAL CURRENT LIABILITIES	165,313	183,211
Deferred taxes	1,460	1,293
TOTAL LIABILITIES	166,773	184,504
COMMITMENTS AND CONTINGENCIES (Note 9)
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; 15,570,952 shares issued at April 30 and January 31, 2018, respectively; 15,567,719 shares outstanding at April 30 and January 31, 2018, respectively	2,336	2,336
Additional paid-in capital	143,783	143,215
Retained earnings	212,095	211,150
Accumulated other comprehensive income	843	1,422
TOTAL STOCKHOLDERS' EQUITY	359,057	358,123
Non-controlling interests	48	43
TOTAL EQUITY	359,105	358,166
TOTAL LIABILITIES AND EQUITY	$ 525,878	$ 542,670