Note B - Summary of Significant Accounting Policies - Property and Equipment, Estimated Useful Lives (Details) - Maximum [Member]	6 Months Ended
Oct. 31, 2016
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment Useful Lives	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment Useful Lives	15 years
Building and Building Improvements [Member]
Property, Plant and Equipment Useful Lives	39 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration