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Note 6 - Stock Options and Incentive Plans (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 12, 2019
Apr. 30, 2019
Apr. 30, 2018
Nov. 30, 2016
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 950  
Butler National Corporation 2016 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       12,500
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 950      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0      
Butler National Corporation 2016 Equity Incentive Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,500      
Share Price $ 0.38      
Deferred Compensation Equity, Ending Balance $ 950      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years