Costs and Estimated Earnings in Excess of Billings (Tables)

12 Months Ended

Apr. 30, 2020

Contractors [Abstract]

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

At April 30, 2020 and 2019, costs and estimated earnings in excess of billings, net, consisted of the following (in thousands):

	2020			2019
Costs and estimated earnings in excess of billings	$	10,460		$	8,278
Billings in excess of costs and estimated earnings		(3,507	)		(1,608	)
Net asset	$	6,953		$	6,670