NOTE E - TREASURY STOCK TRANSACTIONS (Details) - shares	3 Months Ended	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2017
Disclosure Text Block Supplement [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution, Shares	11,530	25,270
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		844