CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Income Statement [Abstract]
Revenues	$ 15,254	$ 12,589
Cost of revenues	14,168	11,397
Gross profit	1,086	1,192
Operating expenses:
Selling, general and administrative	4,459	3,215
Operating loss	(3,373)	(2,023)
Interest and other income, net	209	62
Net Loss	(3,164)	(1,961)
Comprehensive loss	(3,164)	(1,961)
Series E preferred stock accumulated dividends	(1,442)	(1,442)
Net loss attributable to common stockholders	$ (4,606)	$ (3,403)
Basic and diluted net loss per common share attributable to common stockholders	$ (0.08)	$ (0.06)
Weighted average basic and diluted shares outstanding	56,167	55,770