10. Accrued Liabilities (Tables)

12 Months Ended

Apr. 30, 2019

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities at April 30, 2019 and 2018, respectively, consisted of the following (in thousands):

	2019		2018
Vacation and other compensation	$	1,659	$	1,433
Incentive compensation		346		411
Payroll taxes		155		113
Deferred revenue		-		68
Warranty reserve		529		520
Commissions		378		307
Other		504		564
	$	3,571	$	3,416