Costs and Estimated Earnings in Excess of Billings, Net (Tables)

12 Months Ended

Apr. 30, 2021

Contractors [Abstract]

Costs and Estimated Earnings in Excess of Billings, Net [Table Text Block]

At April 30, 2021 and 2020, costs and estimated earnings in excess of billings, net, consisted of the following (in thousands):

	April 30, 2021			April 30, 2020
Costs and estimated earnings in excess of billings	$	12,640		$	10,460
Billings in excess of costs and estimated earnings		(10,692	)		(3,507	)
Net asset	$	1,948		$	6,953