CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Revenues	$ 18,313	$ 10,178	$ 33,567	$ 22,767
Cost of revenues	14,953	9,844	29,121	21,241
Gross profit	3,360	334	4,446	1,526
Operating expenses:
Selling, general and administrative	3,534	2,816	7,993	6,031
Loss on lease termination	355	0	355	0
Total operating expenses	3,889	2,816	8,348	6,031
Operating loss	(529)	(2,482)	(3,902)	(4,505)
Interest and other income, net	99	119	308	181
Loss from continuing operations before income taxes	(430)	(2,363)	(3,594)	(4,324)
Income tax benefit	0	173	0	173
Loss from continuing operations, net of tax	(430)	(2,190)	(3,594)	(4,151)
Income from discontinued operations, net of tax	0	739	0	739
Net Loss	(430)	(1,451)	(3,594)	(3,412)
Comprehensive loss	(430)	(1,451)	(3,594)	(3,412)
Series E preferred stock accumulated dividends	(1,442)	(1,442)	(2,523)	(2,523)
Net loss attributable to common stockholders	$ (1,872)	$ (2,893)	$ (6,117)	$ (5,935)
Basic and Diluted net (loss) income per common share attributable to common stockholders: Continuing Operations	$ (0.03)	$ (0.06)	$ (0.11)	$ (0.12)
Basic and Diluted net (loss) income per common share attributable to common stockholders: Discontinued Operations	0.00	0.01	0.00	0.01
Net loss per common share attributable to common stockholders	$ (0.03)	$ (0.05)	$ (0.11)	$ (0.11)
Weighted average basic and diluted shares outstanding	56,253	56,009	56,210	55,889