CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 27, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,240	$ 2,111
Restricted cash	1,038	705
Marketable securities	345	712
Accounts receivable, less allowances for doubtful receivables of $257 and $324, respectively	5,202	3,972
Costs and estimated earnings in excess of billings on uncompleted contracts	1,636	2,474
Inventories, net	3,914	3,125
Prepaid expenses and deposits	638	453
Total current assets	16,013	13,552
Property, plant and equipment, net	7,353	7,735
Goodwill	635	635
Definite-lived intangible assets, net	128	168
Other assets	1,342	2,160
Total assets	25,471	24,250
Current liabilities:
Accounts payable	1,886	1,197
Accrued liabilities	1,174	1,274
Billings in excess of costs and estimated earnings on uncompleted contracts	3,506	2,531
Customer deposits	3,599	3,180
Current portion of retirement obligations	492	517
Current portion of long-term debt	175	167
Total current liabilities	10,832	8,866
Pension and retirement obligations, net of current portion	32,845	33,369
Long-term debt, net of current portion	5,169	5,148
Deferred rent obligation	1,509	1,511
Total liabilities	50,355	48,894
Commitments and contingencies
Stockholders' deficit:
Preferred stock, no par value: 10,000,000 shares authorized; no shares outstanding
Common stock, $0.20 par value: 30,000,000 shares authorized; 11,441,666 shares issued	2,288	2,288
Additional paid-in capital	54,481	54,466
Common stock in treasury, at cost: 352,467 shares	(4,709)	(4,709)
Accumulated deficit	(49,818)	(49,025)
Accumulated other comprehensive loss	(27,126)	(27,664)
Total stockholders' deficit	(24,884)	(24,644)
Total liabilities and stockholders' deficit	$ 25,471	$ 24,250