INCOME TAXES - Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Assets:
Net operating loss ("NOL") carryforwards	$ 3,478	$ 3,487
Stock options	1,935	1,594
Purchased intangibles	1,508	1,592
Accrued expenses and other	1,713	2,052
Total Assets	8,634	8,725
Liabilities:
Purchased intangibles	(4,508)	(4,428)
Construction contracts	(3,002)	(2,862)
Property and equipment and other	(2,336)	(2,389)
Total Liabilities	(9,846)	(9,679)
Net deferred tax liabilities	$ (1,212)	$ (954)