CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 658	$ 14
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	135	129
Provision for excess and obsolete inventory	159	48
Other	125	1
Changes in operating assets and liabilities:
Increase in accounts receivable	(1,758)	(664)
Decrease in lease receivable	121	134
Decrease (increase) in inventories	(1,367)	323
Increase in contract revenue in excess of billings	(1,140)	(644)
Increase in prepaid expenses and other assets	(60)	(775)
Increase (decrease) in accounts payable	233	(300)
Increase (decrease) in accrued liabilities	406	(46)
Decrease in accrued pension and retirement liabilities	(122)	(115)
Increase in billings in excess of contract revenue	2,964	809
Decrease in deferred rent obligation	(217)	(211)
Net cash provided by (used in) operating activities	137	(1,297)
Cash flows from investing activities:
Purchases of property and equipment	(59)	(86)
Proceeds from sale of property and equipment	3	0
Net cash used in investing activities	(56)	(86)
Cash flows from financing activities:
Principal payments on long-term debt	(110)	(105)
Net cash used in financing activities	(110)	(105)
Net decrease in cash, cash equivalents, and restricted cash	(29)	(1,488)
Cash, cash equivalents, and restricted cash as of beginning of the period	5,588	7,426
Cash, cash equivalents, and restricted cash as of end of the period	5,559	5,938
Cash paid during the period for:
Interest	50	56
Income taxes	$ 48	$ 120