Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Apr. 30, 2020	Jan. 31, 2021	Jan. 31, 2020
REVENUE:
Revenues	$ 14,612	$ 16,800	$ 43,572	$ 53,254
COSTS AND EXPENSES:
Marketing and advertising	877	983	2,723	3,122
Employee benefits	546	592	1,696	1,666
Depreciation and amortization	1,020	1,316	3,664	3,832
General, administrative and other	2,099	1,684	4,989	5,273
Total costs and expenses	12,744	13,912	39,889	42,618
OPERATING INCOME	1,868	2,888	3,683	10,636
OTHER EXPENSE:
Interest expense	(758)	(1,112)	(2,411)	(3,296)
Gain on sale of airplane		75		604
Other	7		7
Total other expense	(751)	(1,037)	(2,404)	(2,692)
INCOME BEFORE INCOME TAXES	1,117	1,851	1,279	7,944
PROVISION FOR INCOME TAXES
Provision for income taxes	185	494	299	2,081
NET INCOME	932	1,357	980	5,863
Net income attributable to noncontrolling interest in BHCMC, LLC	(429)	(22)	(171)	(237)
NET INCOME ATTRIBUTABLE TO BUTLER NATIONAL CORPORATION	$ 503	$ 1,335	$ 809	$ 5,626
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.01	$ 0.02	$ 0.01	$ 0.08
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	74,033,347	67,954,200	74,183,488	68,109,733
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.01	$ 0.02	$ 0.01	$ 0.08
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	74,033,347	67,954,200	74,183,488	68,109,733
Professional Services [Member]
REVENUE:
Revenues	$ 7,901	$ 7,962	$ 20,901	$ 24,186
COSTS AND EXPENSES:
Cost of services and products	3,485	4,030	10,313	11,886
Aerospace Products [Member]
REVENUE:
Revenues	6,711	8,838	22,671	29,068
COSTS AND EXPENSES:
Cost of services and products	$ 4,717	$ 5,307	$ 16,504	$ 16,839