9. Accrued Liabilities

12 Months Ended

Apr. 30, 2017

Payables and Accruals [Abstract]

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

9. Accrued Liabilities

Accrued liabilities at April 30, 2017 and 2016 consist of the following (in thousands):

	2017		2016
Vacation and other compensation	$	1,467	$	1,683
Incentive compensation		265		677
Payroll taxes		128		137
Deferred revenue		232		578
Warranty reserve		557		557
Commissions		234		252
Other		542		595
	$	3,425	$	4,479