Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2016	$ 14,305	$ 91,688	$ (4,280)	$ 101,713
Balance (in shares) at Dec. 31, 2016	14,305
Other comprehensive income			1,670	1,670
Net income		14,061		14,061
Expense of stock options and restricted stock units		522		522
Exercise of stock options	$ 28	131		159
Exercise of stock options (in shares)	28
Settlement of restricted stock units	$ 26	(26)		0
Settlement of restricted stock units (in shares)	26
Dividends declared		(6,607)		(6,607)
Stock issued to directors as compensation	$ 13	139		152
Stock issued to directors as compensation (in shares)	13
Balance at Dec. 30, 2017	$ 14,372	99,908	(2,610)	111,670
Balance (in shares) at Dec. 30, 2017	14,372
Other comprehensive income			$ 2,610	2,610
Net income		20,442		20,442
Expense of stock options and restricted stock units		604		604
Exercise of stock options	$ 9	45		54
Exercise of stock options (in shares)	9
Settlement of restricted stock units	$ 47	(47)		0
Settlement of restricted stock units (in shares)	47
Dividends declared		(7,215)		(7,215)
Stock issued to directors as compensation	$ 12	154		166
Stock issued to directors as compensation (in shares)	12
Purchase of stock	$ (1)	(9)		(10)
Purchase of stock (in shares)	(1)
Balance at Dec. 29, 2018	$ 14,439	113,882		128,321
Balance (in shares) at Dec. 29, 2018	14,439
Net income		7,258		7,258
Expense of stock options and restricted stock units		513		513
Exercise of stock options	$ 10	108		118
Exercise of stock options (in shares)	10
Settlement of restricted stock units	$ 29	(29)		0
Settlement of restricted stock units (in shares)	29
Dividends declared		(7,204)		(7,204)
Stock issued to directors as compensation	$ 9	93		102
Stock issued to directors as compensation (in shares)	9
Purchase of stock	$ (272)	(2,666)		(2,938)
Purchase of stock (in shares)	(272)
Balance at Dec. 28, 2019	$ 14,215	$ 111,955		$ 126,170
Balance (in shares) at Dec. 28, 2019	14,215