CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,856	$ 2,111
Restricted cash	798	705
Marketable securities	599	712
Accounts receivable, less allowances for doubtful receivables of $350 and $324, respectively	4,566	3,972
Costs and estimated earnings in excess of billings on uncompleted contracts	1,612	2,474
Inventories, net	3,438	3,125
Prepaid expenses and deposits	479	453
Total current assets	13,348	13,552
Property, plant and equipment, net	7,584	7,735
Goodwill	635	635
Definite-lived intangible assets, net	155	168
Other assets	1,999	2,160
Total assets	23,721	24,250
Current liabilities:
Accounts payable	1,314	1,197
Accrued liabilities	1,233	1,274
Billings in excess of costs and estimated earnings on uncompleted contracts	3,619	2,531
Customer deposits	2,785	3,180
Current portion of retirement obligations	488	517
Current portion of long-term debt	169	167
Total current liabilities	9,608	8,866
Pension and retirement obligations, net of current portion	33,242	33,369
Long-term debt, net of current portion	5,153	5,148
Deferred rent obligation	1,520	1,511
Total liabilities	49,523	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	54,476	54,466
Common stock in treasury, at cost: 352,467 shares	(4,709)	(4,709)
Accumulated deficit	(50,382)	(49,025)
Accumulated other comprehensive loss	(27,475)	(27,664)
Total stockholders' deficit	(25,802)	(24,644)
Total liabilities and stockholders' deficit	$ 23,721	$ 24,250