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	1,005				1,005
Dividends on common stock	(5,490)				(5,490)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		166,980
Exercise of share option awards	7			7
Exercise of share option awards, Shares		1,075
Share-based compensation	1,263			1,263
Tax deficiency from share-based awards activity	(222)			(222)
Forfeiture of nonvested share awards, Shares		(4,095)
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	(37)					(37)
Purchases of treasury stock, Shares		(3,900)
Ending Balance at Jul. 03, 2016	194,744		247	112,670	114,513	(32,686)
Ending Balance, shares at Jul. 03, 2016		22,024,360
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	8,104				8,104
Dividends on common stock	(6,616)				(6,616)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		203,112
Exercise of share option awards	28			28
Exercise of share option awards, Shares		4,150
Share-based compensation	1,170			1,170
Forfeiture of nonvested share awards, Shares		(15,945)
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)
Purchases of treasury stock	$ (136)					(136)
Purchases of treasury stock, Shares		(10,500)
Ending Balance at Jul. 02, 2017	$ 206,782		$ 249	$ 115,189	$ 125,851	$ (34,507)
Ending Balance, shares at Jul. 02, 2017		22,139,456