Condensed Consolidated Statement of Shareholder's Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Shares outstanding, beginning balance at Apr. 01, 2018		10,631,992
Stockholders' equity, beginning balance at Apr. 01, 2018	$ 202,247	$ 532	$ 53,877	$ 147,242	$ 596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	470		470
Vesting of restricted stock (shares)		24,567
Vesting of restricted stock	0	$ 1	(1)
Shares surrendered for payroll taxes (shares)		8,105
Shares surrendered for payroll taxes	(265)	$ 0	(265)
ESPP shares issued (shares)		22,531
ESPP shares issued	677	$ 1	676
Other comprehensive income, net of tax	27				27
Net income	9,123			9,123
Shares outstanding, ending balance at Jul. 01, 2018		10,670,985
Stockholders' equity, ending balance at Jul. 01, 2018	212,279	$ 534	54,757	156,365	623
Shares outstanding, beginning balance at Apr. 01, 2018		10,631,992
Stockholders' equity, beginning balance at Apr. 01, 2018	202,247	$ 532	53,877	147,242	596
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares surrendered for payroll taxes	$ (265)
Shares repurchased (shares)	0
Shares repurchased	$ 0
Net income	16,532
Shares outstanding, ending balance at Sep. 30, 2018		10,679,469
Stockholders' equity, ending balance at Sep. 30, 2018	217,774	$ 534	55,270	161,362	608
Shares outstanding, beginning balance at Jul. 01, 2018		10,670,985
Stockholders' equity, beginning balance at Jul. 01, 2018	212,279	$ 534	54,757	156,365	623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends paid	(2,412)			(2,412)
Share-based compensation expense	513		513
Vesting of restricted stock (shares)		8,484
Vesting of restricted stock	0	$ 0	0
Other comprehensive income, net of tax	(15)				(15)
Net income	7,409			7,409
Shares outstanding, ending balance at Sep. 30, 2018		10,679,469
Stockholders' equity, ending balance at Sep. 30, 2018	217,774	$ 534	55,270	161,362	608
Shares outstanding, beginning balance at Mar. 31, 2019		10,592,450
Stockholders' equity, beginning balance at Mar. 31, 2019	217,861	$ 530	52,609	164,405	317
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends paid	(2,460)			(2,460)
Share-based compensation expense	509		509
Vesting of restricted stock (shares)		27,620
Vesting of restricted stock	0	$ 1	(1)
Shares surrendered for payroll taxes (shares)		(9,160)
Shares surrendered for payroll taxes	(343)	$ (1)	(342)
Shares repurchased (shares)		(47,136)
Shares repurchased	(1,803)	$ (2)	(1,801)
Other comprehensive income, net of tax	(179)				(179)
Net income	9,807			9,807
Shares outstanding, ending balance at Jun. 30, 2019		10,563,774
Stockholders' equity, ending balance at Jun. 30, 2019	223,392	$ 528	50,974	171,752	138
Shares outstanding, beginning balance at Mar. 31, 2019		10,592,450
Stockholders' equity, beginning balance at Mar. 31, 2019	217,861	$ 530	52,609	164,405	317
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares surrendered for payroll taxes	$ (343)
Shares repurchased (shares)	(91,395)
Shares repurchased	$ (3,793)
Net income	19,057
Shares outstanding, ending balance at Sep. 29, 2019		10,546,453
Stockholders' equity, ending balance at Sep. 29, 2019	229,435	$ 527	50,282	178,557	69
Shares outstanding, beginning balance at Jun. 30, 2019		10,563,774
Stockholders' equity, beginning balance at Jun. 30, 2019	223,392	$ 528	50,974	171,752	138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends paid	(2,445)			(2,445)
Share-based compensation expense	636		636
Vesting of restricted stock (shares)		8,352
Vesting of restricted stock	0	$ 0	0
ESPP shares issued (shares)		18,586
ESPP shares issued	$ 661	$ 1	660
Shares repurchased (shares)	(44,259)	(44,259)
Shares repurchased	$ (1,990)	$ (2)	(1,988)
Other comprehensive income, net of tax	(69)				(69)
Net income	9,250			9,250
Shares outstanding, ending balance at Sep. 29, 2019		10,546,453
Stockholders' equity, ending balance at Sep. 29, 2019	$ 229,435	$ 527	$ 50,282	$ 178,557	$ 69