Note B - Property and Equipment, Estimated Useful Lives (Details)	9 Months Ended
	Jan. 31, 2016
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment Useful Lives	3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment Useful Lives	7 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment Useful Lives	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment Useful Lives	15 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment Useful Lives	18 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment Useful Lives	39 years