NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 31, 2016	Apr. 30, 2015
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	$ 10,707	$ 10,397
Gross Unrealized Gains	907	938
Gross Unrealized Losses	(915)	(149)
Fair Market Value	10,699	11,186
Fixed Income Securities [Member]
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	3,510	3,379
Gross Unrealized Gains	73	104
Gross Unrealized Losses	(25)	(16)
Fair Market Value	3,558	3,467
Equity Securities [Member]
NOTE H - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	7,197	7,018
Gross Unrealized Gains	834	834
Gross Unrealized Losses	(890)	(133)
Fair Market Value	$ 7,141	$ 7,719