CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Cash flows from operating activities:
Net loss	$ (793)	$ (2,195)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	452	569
Amortization of deferred pension expense	546
Other	471	766
Change in assets and liabilities:
Decrease (increase) in restricted cash	(333)	282
Decrease (increase) in accounts receivable, net	(1,287)	362
Increase in inventories	(1,062)	(632)
Decrease (increase) in costs and estimated earnings in excess of billings on uncompleted contracts	1,813	(1,665)
Decrease (increase) in prepaid expenses and deposits	633	(472)
Increase (decrease) in accounts payable	689	(452)
Decrease in accrued liabilities	(102)	(246)
Decrease in pension and retirement obligations	(549)	(188)
Increase in customer deposits	419	636
Net cash provided by (used in) operating activities	897	(3,235)
Cash flows from investing activities:
Purchases of property, plant and equipment	(30)	(96)
Proceeds from sale of marketable securities	385	1,011
Net cash provided by investing activities	355	915
Cash flows from financing activities:
Principal payments on long-term debt	(123)	(116)
Net cash used in financing activities	(123)	(116)
Net increase (decrease) in cash and cash equivalents	1,129	(2,436)
Cash and cash equivalents as of beginning of the period	2,111	3,932
Cash and cash equivalents as of end of the period	3,240	1,496
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	397	405
Cash paid for income taxes	26	43
Non-cash investing and financing activities:
Unrealized gain (loss) on marketable securities	$ (8)	$ 194