CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
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 (loss)			2,610	2,610
Net income		13,287	0	13,287
Expense of stock options and restricted stock units		370	0	370
Exercise of stock options	$ 9	45	0	54
Exercise of stock options (in shares)	9
Settlement of restricted stock units	$ 47	(47)	0	0
Settlement of restricted stock units (in shares)	47
Dividends declared		(3,604)	0	(3,604)
Stock issued to directors as compensation	$ 12	153	0	165
Stock issued to directors as compensation (in shares)	12
Balance at Jul. 14, 2018	$ 14,440	110,112	0	124,552
Balance (in shares) at Jul. 14, 2018	14,440
Balance at Mar. 24, 2018	$ 14,416	99,495	(2,702)	111,209
Balance (in shares) at Mar. 24, 2018	14,416
Other comprehensive income (loss)			2,702	2,702
Net income		12,071	0	12,071
Expense of stock options and restricted stock units		209	0	209
Settlement of restricted stock units	$ 12	(12)	0	0
Settlement of restricted stock units (in shares)	12
Dividends declared		(1,804)	0	(1,804)
Stock issued to directors as compensation	$ 12	153	0	165
Stock issued to directors as compensation (in shares)	12
Balance at Jul. 14, 2018	$ 14,440	110,112	0	124,552
Balance (in shares) at Jul. 14, 2018	14,440
Balance at Dec. 29, 2018	$ 14,439	113,882	0	128,321
Balance (in shares) at Dec. 29, 2018	14,439
Other comprehensive income (loss)			0	0
Net income		2,143	0	2,143
Expense of stock options and restricted stock units		341	0	341
Exercise of stock options	$ 10	108	0	118
Exercise of stock options (in shares)	10
Settlement of restricted stock units	$ 25	(25)	0	0
Settlement of restricted stock units (in shares)	25
Dividends declared		(3,618)	0	(3,618)
Purchase of stock	$ (15)	(149)	0	(164)
Purchase of stock (in shares)	(15)
Stock issued to directors as compensation	$ 9	93	0	102
Stock issued to directors as compensation (in shares)	9
Balance at Jul. 13, 2019	$ 14,468	112,775	0	127,243
Balance (in shares) at Jul. 13, 2019	14,468
Balance at Mar. 23, 2019	$ 14,471	112,545	0	127,016
Balance (in shares) at Mar. 23, 2019	14,471
Other comprehensive income (loss)			0	0
Net income		1,876	0	1,876
Expense of stock options and restricted stock units		197	0	197
Dividends declared		(1,809)	0	(1,809)
Purchase of stock	$ (12)	(127)	0	(139)
Purchase of stock (in shares)	(12)
Stock issued to directors as compensation	$ 9	93	0	102
Stock issued to directors as compensation (in shares)	9
Balance at Jul. 13, 2019	$ 14,468	$ 112,775	$ 0	$ 127,243
Balance (in shares) at Jul. 13, 2019	14,468