Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
REVENUE:
Revenues	$ 15,297	$ 11,156	$ 28,701	$ 22,805
COSTS AND EXPENSES:
Marketing and advertising	1,060	956	2,035	1,810
Employee benefits	481	459	987	935
Depreciation and amortization	395	500	783	982
General, administrative and other	2,286	1,361	3,979	2,686
Total costs and expenses	13,479	10,839	25,983	21,842
OPERATING INCOME	1,818	317	2,718	963
OTHER INCOME (EXPENSE):
Interest expense	(55)	(81)	(124)	(167)
Refund of sales/use tax	1,330		1,610
Total other income (expense)	1,275	(81)	1,486	(167)
INCOME BEFORE INCOME TAXES	3,093	236	4,204	796
PROVISION FOR INCOME TAXES
Deferred income tax expense
Provision for income taxes	637	47	825	181
NET INCOME	2,456	189	3,379	615
Net income attributable to noncontrolling interest in BHCMC, LLC	(735)	(105)	(1,149)	(293)
NET INCOME ATTRIBUTABLE TO BUTLER NATIONAL CORPORATION	$ 1,721	$ 84	$ 2,230	$ 322
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.03	$ 0	$ 0.03	$ 0
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	63,820,359	64,542,699	64,260,774	64,543,127
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.03	$ 0	$ 0.03	$ 0
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	63,820,359	64,542,699	64,260,774	64,543,127
Professional Services [Member]
REVENUE:
Revenues	$ 7,858	$ 7,342	$ 15,806	$ 14,781
COSTS AND EXPENSES:
Cost of services and products	4,926	4,763	9,738	9,596
Aerospace Products [Member]
REVENUE:
Revenues	7,439	3,814	12,895	8,024
COSTS AND EXPENSES:
Cost of services and products	$ 4,331	$ 2,800	$ 8,461	$ 5,833