CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016
Cash flows from operating activities:
Net income	$ 185	$ 236
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	64	73
Provision for excess and obsolete inventory	51	60
Other	82	46
Changes in assets and liabilities:
Increase in restricted cash	(220)	0
Decrease (increase) in accounts receivable	(128)	1,641
Decrease in lease receivable	76	0
Decrease (increase) in inventories	(62)	346
Increase in costs and estimated earnings in excess of billings on uncompleted contracts, net	(66)	(53)
Decrease (increase) in prepaid expenses and other assets	(275)	62
Increase in accounts payable	9	158
Increase in accrued liabilities	139	291
Decrease in pension and retirement obligations	(57)	(38)
Decrease in customer deposits	(200)	(1,072)
Decrease in deferred rent obligation	(106)	(105)
Net cash provided by (used in) operating activities	(508)	1,645
Cash flows from investing activities:
Purchases of property and equipment	(55)	(22)
Cash flows from financing activities:
Principal payments on long-term debt	(52)	(65)
Net increase (decrease) in cash and cash equivalents	(615)	1,558
Cash and cash equivalents as of beginning of the period	6,823	3,734
Cash and cash equivalents as of end of the period	6,208	5,292
Cash paid during the period for:
Interest	28	42
Income taxes	$ 30	$ 11