SEGMENT INFORMATION (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020
Revenue	$ 11,079,000	$ 17,882,000	$ 23,528,000	$ 37,142,000
Gross profit (loss)	$ 82,000	$ 2,453,000	$ 1,086,000	$ 5,713,000
Gross profit margin	0.70%	13.70%	4.60%	15.40%
SG&A	$ 4,264,000	$ 2,314,000	$ 6,825,000	$ 4,447,000
Operating income (loss)	(4,182,000)	139,000	(5,739,000)	1,266,000
Other income, net	6,000	1,000	1,690,000	2,000
Interest expense, net	(57,000)	(36,000)	(115,000)	(41,000)
Tax expense	(23,000)	(36,000)	(46,000)	(58,000)
Net income (loss)	(4,256,000)	68,000	(4,210,000)	1,169,000
Total assets	44,188,000		44,188,000		$ 30,438,000
Corporate
Revenue	0	0	0	0
Gross profit (loss)	$ 0	$ 0	$ 0	$ 0
Gross profit margin	0.00%	0.00%	0.00%	0.00%
SG&A	$ 1,260,000	$ 1,333,000	$ 2,319,000	$ 2,466,000
Operating income (loss)	(1,260,000)	(1,333,000)	(2,319,000)	(2,466,000)
Total assets	33,949,000		33,949,000		16,157,000
Commercial
Revenue	9,157,000	14,803,000	19,206,000	31,313,000
Gross profit (loss)	$ (201,000)	$ 1,910,000	$ 714,000	$ 4,755,000
Gross profit margin	2.20%	12.90%	3.70%	15.20%
SG&A	$ 2,816,000	$ 831,000	$ 4,109,000	$ 1,661,000
Operating income (loss)	(3,017,000)	1,079,000	(3,395,000)	3,094,000
Total assets	7,633,000		7,633,000		11,130,000
Government Services
Revenue	1,922,000	3,079,000	4,322,000	5,829,000
Gross profit (loss)	$ 283,000	$ 543,000	$ 372,000	$ 958,000
Gross profit margin	14.70%	17.60%	8.60%	16.40%
SG&A	$ 188,000	$ 150,000	$ 397,000	$ 320,000
Operating income (loss)	95,000	$ 393,000	(25,000)	$ 638,000
Total assets	$ 2,606,000		$ 2,606,000		$ 3,151,000