CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,365	$ 5,276
Restricted cash	220	312
Accounts receivable, net	3,250	3,794
Current portion of lease receivable	262	247
Contract revenue in excess of billings	3,484	2,763
Inventories, net	3,072	3,973
Prepaid expenses and deposits	655	712
Total current assets	19,308	17,077
Long-term lease receivable, net of current portion	574	836
Property and equipment, net	4,395	4,527
Goodwill	635	635
Other assets	2,249	1,955
Total assets	27,161	25,030
Current liabilities:
Accounts payable	1,527	1,667
Accrued liabilities	1,059	912
Billings in excess of contract revenue	5,959	7,117
Current portion of retirement obligations	621	500
Current portion of pension settlement obligation	438	409
Current portion of long-term debt	237	224
Total current liabilities	9,841	10,829
Retirement obligations, net of current portion	3,601	4,150
Pension settlement obligation, net of current portion	4,042	4,478
Long-term debt, net of current portion	1,303	1,540
Deferred rent obligation	370	808
Total liabilities	19,157	21,805
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; 11,616,866 shares issued	2,323	2,323
Additional paid-in-capital	53,967	53,818
Common stock in treasury, at cost, 264,350 shares	(3,532)	(3,532)
Accumulated deficit	(42,778)	(47,208)
Accumulated other comprehensive loss	(1,976)	(2,176)
Total stockholders' equity	8,004	3,225
Total liabilities and stockholders' equity	$ 27,161	$ 25,030