Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Apr. 30, 2016	May 02, 2015	May 03, 2014
Operating Activities:
Net income	$ 61,198,000	$ 49,311,000	$ 43,635,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	12,056,000	11,580,000	11,708,000
Deferred income tax (benefit) provision	(1,299,000)	1,076,000	79,000
Loss (gain) on disposal of property, net	129,000	(1,188,000)	51,000
Stock-based compensation	228,000	307,000	95,000
Changes in assets and liabilities:
Trade receivables	(1,095,000)	(1,746,000)	5,864,000
Inventories	(4,998,000)	990,000	(4,680,000)
Prepaid and other assets	(485,000)	(605,000)	(2,548,000)
Accounts payable	4,495,000	(710,000)	1,345,000
Accrued and other liabilities	8,726,000	(995,000)	(3,167,000)
Net cash provided by operating activities	78,955,000	58,020,000	52,382,000
Investing Activities:
Additions to property, plant and equipment	(12,140,000)	(11,630,000)	(12,124,000)
Proceeds from sale of property, plant and equipment	116,000	1,905,000	62,000
Net cash used in investing activities	(12,024,000)	(9,725,000)	(12,062,000)
Financing Activities:
Dividends paid on preferred stock	(186,000)	(239,000)	(659,000)
Repayments under credit facilities, net	(10,000,000)	(20,000,000)	(20,000,000)
Redemption of preferred stock	(6,000,000)	(6,000,000)	(8,000,000)
Proceeds from stock options exercised	848,000	228,000	47,000
Stock-based tax benefits	1,528,000	240,000	17,000
Other			(60,000)
Net cash used in financing activities	(13,810,000)	(25,771,000)	(28,655,000)
Net Increase in Cash and Equivalents	53,121,000	22,524,000	11,665,000
Cash and Equivalents - Beginning of Year	52,456,000	29,932,000	18,267,000
Cash and Equivalents - End of Year	105,577,000	52,456,000	29,932,000
Other Cash Flow Information:
Interest paid	116,000	380,000	723,000
Income taxes paid	$ 29,473,000	$ 24,745,000	$ 23,079,000