Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock, At Cost [Member]
Beginning Balance at Jan. 03, 2021	$ 232,638		$ 255	$ 121,837	$ 153,073	$ (42,527)
Beginning Balance, Shares at Jan. 03, 2021		21,930,328
Net income	58,349				58,349
Dividends on common stock	(29,694)				(29,694)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		248,550
Exercise of share option awards	1,800		3	1,797
Exercise of share option awards, Shares		317,675
Share-based compensation	904			904
Forfeiture of nonvested share awards, Shares		(6,055)
Retirement of common stock for payment of withholding tax	(1,046)			(1,046)
Retirement of common stock for payment of withholding tax, Shares		(70,228)
Ending Balance at Jul. 04, 2021	262,951		260	123,490	181,728	(42,527)
Ending Balance, shares at Jul. 04, 2021		22,420,270
Beginning Balance at Apr. 04, 2021	251,200		259	122,188	171,280	(42,527)
Beginning Balance, Shares at Apr. 04, 2021		22,288,260
Net income	36,803				36,803
Dividends on common stock	(26,355)				(26,355)
Issuance of nonvested share awards, Shares		13,070
Exercise of share option awards	824		1	823
Exercise of share option awards, Shares		121,475
Share-based compensation	479			479
Forfeiture of nonvested share awards, Shares		(2,535)
Ending Balance at Jul. 04, 2021	262,951		260	123,490	181,728	(42,527)
Ending Balance, shares at Jul. 04, 2021		22,420,270
Beginning Balance at Jan. 02, 2022	267,309		260	124,909	192,261	(50,121)
Beginning Balance, Shares at Jan. 02, 2022		22,097,467
Net income	18,037				18,037
Dividends on common stock	(11,056)				(11,056)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		284,630
Conversion of vested share unit awards			1	(1)
Conversion of vested share unit awards, Shares		124,012
Exercise of share option awards	$ 272		1	271
Exercise of share option awards, Shares	67,750	67,750
Share-based compensation	$ 1,186			1,186
Forfeiture of nonvested share awards, Shares		(25,210)
Retirement of common stock for payment of withholding tax	$ (1,212)			(1,212)
Retirement of common stock for payment of withholding tax, Shares	(77,340)	(77,340)
Purchases of treasury stock	$ (4,121)					(4,121)
Purchases of treasury stock, Shares		(294,319)
Ending Balance at Jul. 03, 2022	270,415		264	125,151	199,242	(54,242)
Ending Balance, shares at Jul. 03, 2022		22,176,990
Beginning Balance at Apr. 03, 2022	268,901		264	124,501	195,815	(51,679)
Beginning Balance, Shares at Apr. 03, 2022		22,344,586
Net income	8,934				8,934
Dividends on common stock	(5,507)				(5,507)
Issuance of nonvested share awards, Shares		48,070
Exercise of share option awards	27			27
Exercise of share option awards, Shares		6,175
Share-based compensation	623			623
Forfeiture of nonvested share awards, Shares		(22,505)
Purchases of treasury stock	(2,563)					(2,563)
Purchases of treasury stock, Shares		(199,336)
Ending Balance at Jul. 03, 2022	$ 270,415		$ 264	$ 125,151	$ 199,242	$ (54,242)
Ending Balance, shares at Jul. 03, 2022		22,176,990