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 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 declared and 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)
Unrealized gain (loss) on interest rate swap	(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)
Unrealized gain (loss) on interest rate swap	(248)
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 declared and 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)
Unrealized gain (loss) on interest rate swap	(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
Shares outstanding, beginning balance at Mar. 29, 2020		10,512,229
Stockholders' equity, beginning balance at Mar. 29, 2020	233,484	$ 526	50,090	182,947	(79)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared and paid	(2,479)			(2,479)
Share-based compensation expense	700		700
Vesting of restricted stock (shares)		5,263
Vesting of restricted stock	0	$ 0	0
Shares surrendered for payroll taxes (shares)		(1,657)
Shares surrendered for payroll taxes	(54)	$ 0	(54)
Unrealized gain (loss) on interest rate swap	(10)				(10)
Net income	11,788			11,788
Shares outstanding, ending balance at Jun. 28, 2020		10,515,835
Stockholders' equity, ending balance at Jun. 28, 2020	243,429	$ 526	50,736	192,256	(89)
Shares outstanding, beginning balance at Mar. 29, 2020		10,512,229
Stockholders' equity, beginning balance at Mar. 29, 2020	233,484	$ 526	50,090	182,947	(79)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares surrendered for payroll taxes	$ (54)
Shares repurchased (shares)	0
Shares repurchased	$ 0
Unrealized gain (loss) on interest rate swap	29
Net income	23,978
Shares outstanding, ending balance at Sep. 27, 2020		10,545,203
Stockholders' equity, ending balance at Sep. 27, 2020	254,637	$ 527	52,194	201,966	(50)
Shares outstanding, beginning balance at Jun. 28, 2020		10,515,835
Stockholders' equity, beginning balance at Jun. 28, 2020	243,429	$ 526	50,736	192,256	(89)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared and paid	(2,480)			(2,480)
Share-based compensation expense	686		686
Vesting of restricted stock (shares)		8,008
Vesting of restricted stock	0	$ 0	0
ESPP shares issued (shares)		21,360
ESPP shares issued	$ 773	$ 1	772
Shares repurchased (shares)	0
Unrealized gain (loss) on interest rate swap	$ 39				39
Net income	12,190			12,190
Shares outstanding, ending balance at Sep. 27, 2020		10,545,203
Stockholders' equity, ending balance at Sep. 27, 2020	$ 254,637	$ 527	$ 52,194	$ 201,966	$ (50)