CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 28, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 4,818	$ 3,376
Restricted cash	1,001	1,020
Marketable securities	119	229
Accounts receivable, less allowances for doubtful receivables of $305 and $277, respectively	5,147	5,552
Costs and estimated earnings in excess of billings on uncompleted contracts	1,560	2,391
Inventories, net	2,971	3,025
Prepaid expenses and deposits	588	568
Total current assets	16,204	16,161
Property, plant and equipment, net	7,349	7,405
Goodwill	635	635
Definite-lived intangible assets, net	104	115
Other assets	1,307	1,386
Total assets	25,599	25,702
Current liabilities:
Accounts payable	778	1,433
Accrued liabilities	1,169	1,183
Billings in excess of costs and estimated earnings on uncompleted contracts	4,513	3,358
Customer deposits	2,006	2,157
Current portion of retirement obligations	519	531
Current portion of long-term debt	3,057	2,995
Total current liabilities	12,042	11,657
Pension and retirement obligations, net of current portion	23,565	23,567
Long-term debt, net of current portion	2,316	2,362
Deferred rent obligation	1,518	1,514
Total liabilities	39,441	39,100
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	54,489	54,484
Common stock in treasury, at cost: 352,467 shares	(4,709)	(4,709)
Accumulated deficit	(48,403)	(47,852)
Accumulated other comprehensive loss	(17,507)	(17,609)
Total stockholders' deficit	(13,842)	(13,398)
Total liabilities and stockholders' deficit	$ 25,599	$ 25,702