INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Deferred tax liabilities [Abstract]
Depreciation	$ (550)	$ (656)
Deferred tax assets [Abstract]
Accounts receivable allowance	18	20
Inventory and other allowances	1,734	1,693
Vacation accruals	101	110
Total gross deferred tax assets	1,853	1,823
Less valuation allowance	0	0
Net deferred tax assets	1,303	1,167
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%	4.00%
Permanent tax (in hundredths)	3.70%	6.80%
Other (in hundredths)	(54.30%)	(15.10%)
Effective tax rate (in hundredths)	(84.60%)	29.70%
Income tax expense [Abstract]
Deferred income tax (benefit)	(136)	59	0
Current income tax (benefit)	(680)	764	1,171
Total income tax expense (benefit)	(816)	823	1,171
Current federal income tax expense	(650)	594
Current state income tax expense	(30)	170
Accrued income taxes	$ (1,395)	$ 47