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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Contract revenue	$ 129,416	$ 117,494	$ 104,396	$ 91,793	$ 86,438	$ 71,386	$ 59,833	$ 54,595	$ 443,099	$ 272,252	$ 273,352
Income from operations	5,529	1,295	2,773	(234)	1,679	4,913	4,205	1,974	9,363	12,771	13,704
Income tax (benefit) expense	1,188	(376)	(70)	(927)	(93)	1,597	869	(242)	(185)	2,131	1,562
Net income (loss)	$ 3,202	$ 416	$ 1,640	$ (417)	$ 1,201	$ 3,311	$ 3,315	$ 2,203	$ 4,841	$ 10,030	$ 12,129
Earnings per share:
Basic	$ 0.28	$ 0.04	$ 0.15	$ (0.04)	$ 0.11	$ 0.37	$ 0.38	$ 0.25	$ 0.43	$ 1.08	$ 1.42
Diluted	$ 0.27	$ 0.04	$ 0.14	$ (0.04)	$ 0.11	$ 0.35	$ 0.36	$ 0.24	$ 0.41	$ 1.03	$ 1.32
Weighted-average shares outstanding:
Basic	11,357	11,217	11,100	10,974	10,662	8,844	8,796	8,753	11,162	9,264	8,541
Diluted	11,913	11,789	11,679	10,974	11,217	9,343	9,288	9,185	11,766	9,763	9,155

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