NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Oct. 31, 2014	Apr. 30, 2014
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Line Items]
Fair Value, Less than 12 months	$ 2,360	$ 867
Unrealized Losses, Less than 12 months	(94)	(4)
Fair Value, 12 Months or More	1,076	1,373
Unrealized Losses, 12 Months or More	(30)	(185)
Fair Value	3,436	2,240
Unrealized Losses	(124)	(189)
Fixed Income Securities [Member]
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Line Items]
Fair Value, Less than 12 months	200	501
Unrealized Losses, Less than 12 months	(3)	(3)
Fair Value, 12 Months or More	454	448
Unrealized Losses, 12 Months or More	(25)	(33)
Fair Value	654	949
Unrealized Losses	(28)	(36)
Equity Securities [Member]
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Line Items]
Fair Value, Less than 12 months	2,160	366
Unrealized Losses, Less than 12 months	(91)	(1)
Fair Value, 12 Months or More	622	925
Unrealized Losses, 12 Months or More	(5)	(152)
Fair Value	2,782	1,291
Unrealized Losses	$ (96)	$ (153)