Consolidated Statements of Changes in Stockholder's Equity Statement - USD ($)	Total	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Beginning balance (in shares) at Dec. 31, 2017		35,436,252
Beginning balance at Dec. 31, 2017	$ 169,060,000	$ 354,000	$ 0	$ 144,650,000	$ 25,407,000	$ (1,210,000)	$ (141,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,585,000	$ 0	0	1,585,000	0	0	0
Vesting of non-vested shares and excess tax benefits (in shares)		283,248
Vesting of non-vested shares	0	$ 3,000	0	(3,000)	0	0	0
Net income	(3,102,000)	$ 0	0	0	(3,102,000)	0	0
Ending balance (in shares) at Apr. 01, 2018		35,719,500
Ending balance at Apr. 01, 2018	$ 167,543,000	$ 357,000	0	146,232,000	22,305,000	(1,210,000)	(141,000)
Beginning balance (in shares) at Dec. 30, 2018	35,742,427	35,742,427
Beginning balance at Dec. 30, 2018	$ 185,540,000	$ 357,000	0	150,459,000	35,511,000	(646,000)	(141,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,526,000	$ 0	0	1,526,000	0	0	0
Vesting of non-vested shares and excess tax benefits (in shares)		371,824
Vesting of non-vested shares	0	$ 4,000	0	(4,000)	0	0	0
Net income	$ (11,469,000)	$ 0	0	0	(11,469,000)	0	0
Ending balance (in shares) at Mar. 31, 2019	36,114,251	36,114,251
Ending balance at Mar. 31, 2019	$ 183,101,000	$ 361,000	$ 0	$ 151,981,000	$ 31,546,000	$ (646,000)	$ (141,000)