Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
REVENUE:
Revenues	$ 13,404	$ 11,649
COSTS AND EXPENSES:
Marketing and advertising	975	853
Employee benefits	505	476
Depreciation and amortization	388	482
General, administrative and other	1,693	1,325
Total costs and expenses	12,503	11,003
OPERATING INCOME	901	646
OTHER INCOME (EXPENSE):
Interest expense	(70)	(86)
Refund of sales/use tax	279
Total other income (expense)	209	(86)
INCOME BEFORE INCOME TAXES	1,110	560
PROVISION FOR INCOME TAXES
Provision for income taxes	188	134
NET INCOME	922	426
Net income attributable to noncontrolling interest in BHCMC, LLC	(413)	(188)
NET INCOME ATTRIBUTABLE TO BUTLER NATIONAL CORPORATION	$ 509	$ 238
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.01	$ 0
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	64,743,042	64,543,550
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.01	$ 0
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	64,743,042	64,543,550
Professional Services [Member]
REVENUE:
Revenues	$ 7,948	$ 7,439
COSTS AND EXPENSES:
Cost of services and products	4,812	4,834
Aerospace Products [Member]
REVENUE:
Revenues	5,456	4,210
COSTS AND EXPENSES:
Cost of services and products	$ 4,130	$ 3,033