5. Costs and Estimated Earnings in Excess of Billings (Tables)

12 Months Ended

Apr. 30, 2019

Contractors [Abstract]

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

At April 30, 2019 and 2018, costs and estimated earnings in excess of billings, net, consisted of the following (in thousands):

	2019			2018
Costs and estimated earnings in excess of billings	$	8,278		$	5,266
Billings in excess of costs and estimated earnings		(1,608	)		(172	)
Net asset	$	6,670		$	5,094