Note 10 - Industry Segmentation and Sales by Major Customer (Tables)

12 Months Ended

Apr. 30, 2017

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Year ended April 30, 2017	Professional Services		Aerospace Products		Consolidated
Total revenues	$	30,849	$	19,770	$	50,619
Depreciation and amortization		1,423		562		1,985
Operating income		1,622		1,878		3,500
Capital expenditures, net		2,296		884		3,180
Interest expense		-		-		(403	)
Other income (expense)		-		-		(16	)
Income before taxes		-		-		3,082
Income tax expense		-		-		768
Net income attributable to Butler National Corporation		-		-		1,534
Identifiable assets, net		21,863		20,915		42,778

Year ended April 30, 2016	Professional Services		Aerospace Products			Consolidated
Total revenues	$	29,784	$	15,010		$	44,794
Depreciation and amortization		1,390		784			2,174
Operating income (loss)		1,597		(975	)		622
Capital expenditures, net		1,183		1,574			2,757
Interest expense		-		-			(471	)
Other income (expense)		-		-			21
Income before taxes		-		-			908
Income tax expense		-		-			93
Net income attributable to Butler National Corporation		-		-			24
Identifiable assets, net		22,462		20,235			42,697

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

	2017			2016
Aerospace Products – one customer		10.5	%		N/A *
Professional Services		N/A *			N/A *