Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2016	May 02, 2015	May 03, 2014		Apr. 27, 2013
Internal Revenue Service (IRS) [Member] | Review of Fed Review of Federal Income Tax Returns Three Years Ended April 2013 [Member]
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations			$ 1,907
Unrecognized Tax Benefits	$ 1,678,000	$ 1,801,000	2,123,000		$ 4,349,000
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	59,000
Changes in IncomeTax if All Uncertain Tax Positions Prevail	1,200,000
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	268,000	$ 444,000	$ 2,494,000	[1]
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	227,000
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 42,000

[1] Includes $1,907 related to the Internal Revenue Service review of the Company's federal income tax returns for the three years ended April 2013 noted above.