CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 5,541	$ 3,825	$ 7,755	$ 2,485
Other comprehensive (loss) gain:
Unrealized (loss) gain on available for sale marketable securities, net of tax	(76)	139	67	57
Comprehensive income	$ 5,465	$ 3,964	$ 7,822	$ 2,542