NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 31, 2015	Apr. 30, 2015
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	$ 9,989	$ 10,397
Gross Unrealized Gains	737	938
Gross Unrealized Losses	(362)	(149)
Fair Market Value	10,364	11,186
Fixed Income Securities [Member]
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	3,225	3,379
Gross Unrealized Gains	70	104
Gross Unrealized Losses	(27)	(16)
Fair Market Value	3,268	3,467
Equity Securities [Member]
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	6,764	7,018
Gross Unrealized Gains	667	834
Gross Unrealized Losses	(335)	(133)
Fair Market Value	$ 7,096	$ 7,719