Note 10 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Stock Issued During Period, Shares, Employee Benefit Plan (in shares)		997,639	1,328,190
Stock Issued During Period, Value, Employee Benefit Plan		$ 783	$ 807
Butler National Corporation 2016 Equity Incentive Plan [Member] | Director [Member]
Stock Issued During Period, Value, Employee Benefit Plan		$ 352
Stock Issued During Period, Shares, Issued for Services (in shares)	400,000	400,000