INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Deferred tax liabilities [Abstract]
Depreciation	$ (352)	$ (550)
Deferred tax assets [Abstract]
Accounts receivable allowance	28	18
Inventory and other allowances	1,548	1,734
Vacation accruals	111	101
Total gross deferred tax assets	1,687	1,853
Less valuation allowance	0	0
Net deferred tax assets	1,335	1,303
Reconciliation of the federal statutory income tax rate [Abstract]
Statutory federal income tax rate (benefit) expense, net of noncontrolling interest (in hundredths)	34.00%	(34.00%)
State income tax net of federal benefits (in hundredths)	0.00%	0.00%
Permanent tax (in hundredths)	26.90%	3.70%
Other (in hundredths)	(38.00%)	(54.30%)
Effective tax rate (in hundredths)	22.90%	(84.60%)
Income tax expense [Abstract]
Deferred income tax (benefit)	(33)	(136)	59
Current income tax (benefit)	66	(680)	764
Total income tax expense (benefit)	33	(816)	823
Current federal income tax expense	66	(650)
Current state income tax expense	0	(30)
Accrued income taxes	$ 0	$ (1,395)