Note 8 - Schedule of Components of Deferred Tax Asset and Deferred Tax Liability (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Apr. 30, 2016
Domestic Tax Authority [Member]
Unrealized gains on securities available-for-sale	$ (239)	$ (68)
Capital loss carryforward		86
Operating lease deferred obligation	41	58
Deferred professional fees	17	77
Deferred charges	249	250
Total federal tax benefit	68	403
Deferred gain on deconsolidation of EAM	17,726	17,679
Deferred non-cash post-employment compensation	(619)	(619)
Depreciation and amortization	1,454	1,812
Other	(120)	8
Total federal tax liability	18,441	18,880
Other	(120)	8
Deferred tax liability, long term	18,441	18,880
State and Local Jurisdiction [Member]
Total federal tax benefit	28	29
Other	28	29
Deferred gain on deconsolidation of EAM	1,702	1,704
Deferred non-cash post-employment compensation	(60)	(60)
Depreciation and amortization	140	174
Other	(10)	(15)
Total federal tax liability	1,772	1,803
Other	(10)	(15)
Deferred tax liability, long term	1,772	1,803
Total federal tax benefit	96	432
Total federal tax liability	20,213	20,683
Deferred tax liability, long term	$ 20,213	$ 20,683