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, 2016	$ 198,831		$ 246	$ 112,236	$ 118,998	$ (32,649)
Beginning Balance, Shares at Jan. 03, 2016		21,917,982
Net income	9,192				9,192
Dividends on common stock	(8,223)				(8,223)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		166,980
Exercise of share option awards	47			47
Exercise of share option awards, Shares		6,225
Share-based compensation	1,790			1,790
Tax deficiency from share-based awards activity	(222)			(222)
Forfeiture of nonvested share awards, Shares		(15,770)
Retirement of common stock for payment of withholding tax	(613)		(1)	(612)
Retirement of common stock for payment of withholding tax, Shares		(53,682)
Purchases of treasury stock	(1,610)					(1,610)
Purchases of treasury stock, Shares		(126,899)
Ending Balance at Oct. 02, 2016	199,192		247	113,237	119,967	(34,259)
Ending Balance, shares at Oct. 02, 2016		21,894,836
Beginning Balance at Jan. 01, 2017	205,037		248	114,797	124,363	(34,371)
Beginning Balance, Shares at Jan. 01, 2017		22,012,651
Net income	14,054				14,054
Dividends on common stock	(9,849)				(9,849)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		203,112
Exercise of share option awards	67			67
Exercise of share option awards, Shares		11,086
Share-based compensation	1,750			1,750
Forfeiture of nonvested share awards, Shares		(21,555)
Retirement of common stock for payment of withholding tax	$ (805)		(1)	(804)
Retirement of common stock for payment of withholding tax, Shares	(54,012)	(54,012)
Net disgorgement of stockholder's short-swing profits	$ 136			136
Purchases of treasury stock	(6,904)					(6,904)
Purchases of treasury stock, Shares		(677,109)
Ending Balance at Oct. 01, 2017	$ 203,486		$ 249	$ 115,944	$ 128,568	$ (41,275)
Ending Balance, shares at Oct. 01, 2017		21,474,173