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Note 8 - Stock Options and Incentive Plans	6 Months Ended
Note 8 - Stock Options and Incentive Plans	Oct. 31, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	8. Stock Options and Incentive Plans: At October 31, 2018 we had no outstanding stock options. In November 2016, the shareholders approved and adopted the Butler National Corporation 2016 Equity Incentive Plan. The maximum number of shares of common stock that may be issued under the Plan is 12.5 million. No equity awards have been made under the plan.