SEGMENT INFORMATION (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) segment	Apr. 01, 2016 USD ($)	Dec. 30, 2016 USD ($)
SEGMENT INFORMATION
Number of reporting segments | segment	4
Segment reconciliation
Contract revenue	$ 68,351,000	$ 33,915,000
Depreciation and amortization	909,000	610,000
Segment profit (loss) before income tax expense	1,968,000	1,789,000
Income tax expense (benefit)	(673,000)	711,000
Net income (loss)	2,641,000	1,078,000
Segment assets(1)	116,024,000	93,382,000	$ 108,347,000
Intersegment
Segment reconciliation
Contract revenue	0	0
Reporting Segments | Energy Efficiency Services
Segment reconciliation
Contract revenue	50,114,000	18,979,000
Segment profit (loss) before income tax expense	283,000	890,000
Net income (loss)	379,000	536,000
Segment assets(1)	74,185,000	66,886,000
Reporting Segments | Engineering Services
Segment reconciliation
Contract revenue	14,376,000	11,262,000
Segment profit (loss) before income tax expense	1,991,000	1,067,000
Net income (loss)	2,673,000	643,000
Segment assets(1)	13,059,000	13,983,000
Reporting Segments | Financial Services
Segment reconciliation
Contract revenue	3,238,000	2,989,000
Segment profit (loss) before income tax expense	186,000	50,000
Net income (loss)	249,000	30,000
Segment assets(1)	5,834,000	5,964,000
Reporting Segments | Homeland Security Services
Segment reconciliation
Contract revenue	623,000	685,000
Segment profit (loss) before income tax expense	(26,000)	25,000
Net income (loss)	(35,000)	15,000
Segment assets(1)	796,000	1,369,000
Unallocated Corporate
Segment reconciliation
Segment profit (loss) before income tax expense	(466,000)	(243,000)
Net income (loss)	(625,000)	(146,000)
Segment assets(1)	45,280,000	28,310,000
Intersegment
Segment reconciliation
Segment assets(1)	$ (23,130,000)	$ (23,130,000)