INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Assets:
Net operating loss ("NOL") carryforwards	$ 3,487	$ 3,345
Stock options	1,594	2,354
Purchased intangibles	1,592	2,233
Accrued expenses and others	2,052	2,144
Total Assets	8,725	10,076
Liabilities:
Purchased intangibles	(4,428)	(4,375)
Construction contracts	(2,862)	(3,681)
Property and equipment and other	(2,389)	(2,244)
Total Liabilities	(9,679)	(10,300)
Net deferred tax liabilities	(954)	(224)
Net operating losses	7,900
Prepaid income taxes	$ 3,900	$ 3,300