CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 6,024	$ 8,365
Restricted cash	252	220
Accounts receivable, net	3,319	3,250
Current portion of lease receivable	274	262
Contract revenue in excess of billings	3,563	3,484
Inventories, net	2,615	3,072
Prepaid expenses and deposits	461	655
Total current assets	16,508	19,308
Long-term lease receivable, net of current portion	367	574
Operating lease right-of-use asset	2,592	187
Property and equipment, net	4,297	4,395
Goodwill	635	635
Other assets	2,009	2,249
Total assets	26,408	27,348
Current liabilities:
Accounts payable	1,049	1,527
Accrued liabilities	1,428	1,059
Billings in excess of contract revenue	4,198	5,959
Current portion of operating lease liability	300	188
Current portion of retirement obligations	668	621
Current portion of pension settlement obligation	438	438
Current portion of long-term debt	247	237
Total current liabilities	8,328	10,029
Operating lease liability, net of current portion	2,268	0
Retirement obligations, net of current portion	3,430	3,601
Pension settlement obligation, net of current portion	4,042	4,042
Long-term debt, net of current portion	1,116	1,303
Total liabilities	19,184	18,975
Stockholders' equity:
Preferred stock, no par value: 10,000,000 shares authorized; no shares outstanding	0	0
Common stock, $0.20 par value: 30,000,000 shares authorized; 11,746,866 shares issued	2,349	2,323
Additional paid-in-capital	54,034	53,967
Common stock in treasury, at cost, 264,350 shares	(3,532)	(3,532)
Accumulated deficit	(43,651)	(42,409)
Accumulated other comprehensive loss	(1,976)	(1,976)
Total stockholders' equity	7,224	8,373
Total liabilities and stockholders' equity	$ 26,408	$ 27,348