Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
REVENUE:
Revenues	$ 16,800	$ 14,292	$ 53,254	$ 42,993
COSTS AND EXPENSES:
Marketing and advertising	983	1,021	3,122	3,056
Employee benefits	592	532	1,666	1,518
Depreciation and amortization	1,316	415	3,832	1,198
General, administrative and other	1,684	1,873	5,273	5,852
Total costs and expenses	13,912	12,479	42,618	38,461
OPERATING INCOME	2,888	1,813	10,636	4,532
OTHER INCOME (EXPENSE):
Interest expense	(1,112)	(44)	(3,296)	(169)
Refund of sales/use tax		385		1,995
Gain on sale of airplane	75		604
Total other income (expense)	(1,037)	341	(2,692)	1,826
INCOME BEFORE INCOME TAXES	1,851	2,154	7,944	6,358
PROVISION FOR INCOME TAXES
Provision for income taxes	494	495	2,081	1,320
NET INCOME	1,357	1,659	5,863	5,038
Net income attributable to noncontrolling interest in BHCMC, LLC	(22)	(319)	(237)	(1,468)
NET INCOME ATTRIBUTABLE TO BUTLER NATIONAL CORPORATION	$ 1,335	$ 1,340	$ 5,626	$ 3,570
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.02	$ 0.02	$ 0.08	$ 0.06
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	67,954,200	63,976,255	68,109,733	64,356,380
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.02	$ 0.02	$ 0.08	$ 0.06
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	67,954,200	63,976,255	68,109,733	64,356,380
Professional Services [Member]
REVENUE:
Revenues	$ 7,962	$ 7,617	$ 24,186	$ 23,423
COSTS AND EXPENSES:
Cost of services and products	4,030	4,996	11,886	14,735
Aerospace Products [Member]
REVENUE:
Revenues	8,838	6,675	29,068	19,570
COSTS AND EXPENSES:
Cost of services and products	$ 5,307	$ 3,642	$ 16,839	$ 12,102