Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,572,668
Beginning Balance at Dec. 31, 2019	$ 292,800	$ 116	$ 88,399	$ 212,553	$ (8,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,020			13,020
Other comprehensive income, net of tax	540				540
Employee stock purchase plan (in shares)		27,104
Employee stock purchase plan	1,112		1,112
Stock options exercised (in shares)		10,770
Stock options exercised	270		270
Stock awards vested (in shares)		131,886
Stock awards vested	0	$ 2	(2)
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(59,297)
Stock repurchased related to the exercise of stock options and stock awards vested	(2,664)	$ (1)	(2,663)
Stock-based compensation	4,529		4,529
Ending Balance (in shares) at Jun. 27, 2020		11,683,131
Ending Balance at Jun. 27, 2020	309,607	$ 117	91,645	225,573	(7,728)
Beginning Balance at Dec. 31, 2019	292,800	$ 116	88,399	212,553	(8,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	19,521
Other comprehensive income, net of tax	729
Ending Balance (in shares) at Sep. 26, 2020		11,714,590
Ending Balance at Sep. 26, 2020	319,435	$ 117	94,783	232,074	(7,539)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,683,131
Beginning Balance at Jun. 27, 2020	309,607	$ 117	91,645	225,573	(7,728)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	6,501			6,501
Other comprehensive income, net of tax	189				189
Employee stock purchase plan (in shares)		30,181
Employee stock purchase plan	1,085		1,085
Stock options exercised (in shares)		2,557
Stock options exercised	79		79
Stock awards vested (in shares)		1,205
Stock awards vested	0
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(2,484)
Stock repurchased related to the exercise of stock options and stock awards vested	(102)		(102)
Stock-based compensation	2,076		2,076
Ending Balance (in shares) at Sep. 26, 2020		11,714,590
Ending Balance at Sep. 26, 2020	319,435	$ 117	94,783	232,074	(7,539)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,714,590
Beginning Balance (in shares)		11,728,212
Beginning Balance at Dec. 31, 2020	329,334	$ 117	97,090	241,727	(9,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,118			15,118
Other comprehensive income, net of tax	490				490
Employee stock purchase plan (in shares)		31,580
Employee stock purchase plan	1,558		1,558
Stock options exercised (in shares)		31,527
Stock options exercised	1,120		1,120
Stock awards vested (in shares)		244,008
Stock awards vested	0	$ 3	(3)
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(140,520)
Stock repurchased related to the exercise of stock options and stock awards vested	(7,892)	$ (1)	(7,891)
Stock-based compensation	5,742		5,742
Ending Balance (in shares) at Jul. 03, 2021		11,894,807
Ending Balance at Jul. 03, 2021	345,470	$ 119	97,616	256,845	(9,110)
Beginning Balance at Dec. 31, 2020	329,334	$ 117	97,090	241,727	(9,600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	24,702
Other comprehensive income, net of tax	735
Ending Balance (in shares) at Oct. 02, 2021		11,922,399
Ending Balance at Oct. 02, 2021	358,948	$ 119	101,265	266,429	(8,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,894,807
Beginning Balance at Jul. 03, 2021	345,470	$ 119	97,616	256,845	(9,110)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	9,584			9,584
Other comprehensive income, net of tax	245				245
Employee stock purchase plan (in shares)		24,944
Employee stock purchase plan	1,345		1,345
Stock options exercised (in shares)		8,557
Stock options exercised	280		280
Stock awards vested (in shares)		1,365
Stock awards vested	0
Stock repurchased related to the exercise of stock options and stock awards vested (in shares)		(7,274)
Stock repurchased related to the exercise of stock options and stock awards vested	(383)		(383)
Stock-based compensation	2,407		2,407
Ending Balance (in shares) at Oct. 02, 2021		11,922,399
Ending Balance at Oct. 02, 2021	$ 358,948	$ 119	$ 101,265	$ 266,429	$ (8,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)		11,922,399