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 Dec. 31, 2017	$ 187,069		$ 249	$ 116,495	$ 112,424	$ (42,099)
Beginning Balance, Shares at Dec. 31, 2017		21,345,159
Cumulative adjustment from change in accounting principle, net of tax	575				575
Net income (loss)	(1,309)				(1,309)
Dividends on common stock	(3,189)				(3,189)
Issuance of nonvested share awards			2	(2)
Issuance of nonvested share awards, Shares		195,620
Exercise of share option awards	32			32
Exercise of share option awards, Shares		6,500
Share-based compensation	601			601
Forfeiture of nonvested share awards, Shares		(2,430)
Retirement of common stock for payment of withholding tax	(366)		(1)	(365)
Retirement of common stock for payment of withholding tax, Shares		(53,343)
Purchases of treasury stock	(428)					(428)
Purchases of treasury stock, Shares		(75,748)
Ending Balance at Apr. 01, 2018	182,985		250	116,761	108,501	(42,527)
Ending Balance, shares at Apr. 01, 2018		21,415,758
Beginning Balance at Dec. 30, 2018	174,861		250	118,351	98,787	(42,527)
Beginning Balance, Shares at Dec. 30, 2018		21,424,094
Cumulative adjustment from change in accounting principle, net of tax	(339)				(339)
Net income (loss)	1,664				1,664
Dividends on common stock	(1,068)				(1,068)
Issuance of nonvested share awards			3	(3)
Issuance of nonvested share awards, Shares		265,792
Share-based compensation	538			538
Forfeiture of nonvested share awards, Shares		(6,320)
Retirement of common stock for payment of withholding tax	$ (221)		(1)	(220)
Retirement of common stock for payment of withholding tax, Shares	(59,094)	(59,094)
Ending Balance at Mar. 31, 2019	$ 175,435		$ 252	$ 118,666	$ 99,044	$ (42,527)
Ending Balance, shares at Mar. 31, 2019		21,624,472