CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Contributed in Excess of Par Value	Accumulated Earnings	Accumulated Other Comprehensive Loss
balance at May. 03, 2015	$ 119,427	$ 611	$ 43,159	$ 75,752	$ (95)
balance (in shares) at May. 03, 2015		12,219,121
net income (loss)	16,935			16,935
stock-based compensation	2,742		2,742
unrealized gain (loss) on investments	(49)				(49)
excess tax benefit related to stock-based compensation	841		841
common stock repurchased	(2,397)	$ (5)	(2,392)
common stock repurchased (in shares)		(100,776)
common stock issued in connection with vesting of performance-based restricted stock units		$ 6	(6)
common stock issued in connection with vesting of performance based restricted stock units (in shares)		115,855
fully vested common stock award		3,000
common stock issued in connection with exercise of stock options	$ 200	$ 3	197
common stock issued in connection with exercise of stock options (in shares)	54,500	54,500
common stock issued surrendered for withholding taxes payable	$ (747)	$ (1)	(746)
common stock surrendered for the cost of stock option exercises and withholding taxes payable (in shares)		(26,211)
dividends paid	(8,140)			(8,140)
balance at May. 01, 2016	128,812	$ 614	43,795	84,547	(144)
balance (in shares) at May. 01, 2016		12,265,489
net income (loss)	5,313
balance at Jul. 31, 2016	131,435
balance at May. 01, 2016	128,812	$ 614	43,795	84,547	(144)
balance (in shares) at May. 01, 2016		12,265,489
net income (loss)	22,334			22,334
stock-based compensation	3,358		3,358
unrealized gain (loss) on investments	140				140
excess tax benefit related to stock-based compensation	657		657
common stock repurchased (in shares)		0
common stock issued in connection with vesting of performance-based restricted stock units		$ 2	(2)
common stock issued in connection with vesting of performance based restricted stock units (in shares)		49,192
fully vested common stock award		4,800
common stock issued in connection with exercise of stock options	$ 588	$ 3	585
common stock issued in connection with exercise of stock options (in shares)	68,000	68,000
common stock issued surrendered for withholding taxes payable	$ (979)	$ (1)	(978)
common stock surrendered for the cost of stock option exercises and withholding taxes payable (in shares)		(30,850)
dividends paid	(6,280)			(6,280)
balance at Apr. 30, 2017	148,630	$ 618	47,415	100,601	(4)
balance (in shares) at Apr. 30, 2017		12,356,631
balance at Jul. 31, 2016	131,435
net income (loss)	4,475
balance at Oct. 30, 2016	135,949
net income (loss)	6,347
balance at Jan. 29, 2017	142,314
net income (loss)	6,198
balance at Apr. 30, 2017	148,630	$ 618	47,415	100,601	(4)
balance (in shares) at Apr. 30, 2017		12,356,631
net income (loss)	4,984
balance at Jul. 30, 2017	149,677
balance at Apr. 30, 2017	148,630	$ 618	47,415	100,601	(4)
balance (in shares) at Apr. 30, 2017		12,356,631
net income (loss)	20,877			20,877
stock-based compensation	2,212		2,212
loss on foreign currency cash flow hedge instrument	(55)				(55)
unrealized gain (loss) on investments	(26)				(26)
common stock repurchased (in shares)		0
common stock issued in connection with vesting of performance-based restricted stock units		$ 6	(6)
common stock issued in connection with vesting of performance based restricted stock units (in shares)		118,845
fully vested common stock award		4,800
common stock issued in connection with vesting of time- based restricted stock unit (in shares)		1,200
common stock issued in connection with exercise of stock options	$ 111	$ 1	110
common stock issued in connection with exercise of stock options (in shares)	15,600	15,600
common stock issued surrendered for withholding taxes payable	$ (1,530)	$ (2)	(1,528)
common stock surrendered for the cost of stock option exercises and withholding taxes payable (in shares)		(46,800)
dividends paid	(6,843)			(6,843)
balance at Apr. 29, 2018	163,376	$ 623	48,203	114,635	(85)
balance (in shares) at Apr. 29, 2018		12,450,276
balance at Jul. 30, 2017	149,677
net income (loss)	3,976
balance at Oct. 29, 2017	153,080
net income (loss)	(748)
balance at Jan. 28, 2018	152,182
net income (loss)	12,666
balance at Apr. 29, 2018	$ 163,376	$ 623	$ 48,203	$ 114,635	$ (85)
balance (in shares) at Apr. 29, 2018		12,450,276