CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 5,962	$ 8,365
Restricted cash	31	220
Accounts receivable, net	4,957	3,250
Current portion of lease receivable	278	262
Contract revenue in excess of billings	2,655	3,484
Inventories, net	2,516	3,072
Prepaid expenses and deposits	652	655
Total current assets	17,051	19,308
Long-term lease receivable, net of current portion	295	574
Operating lease right-of-use asset	2,509	187
Property and equipment, net	4,260	4,395
Goodwill	635	635
Other assets	1,928	2,249
Total assets	26,678	27,348
Current liabilities:
Accounts payable	1,243	1,527
Accrued liabilities	1,214	1,059
Billings in excess of contract revenue	5,428	5,959
Current portion of operating lease liability	307	188
Current portion of retirement obligations	682	621
Current portion of pension settlement obligation	468	438
Current portion of long-term debt	251	237
Total current liabilities	9,593	10,029
Operating lease liability, net of current portion	2,189	0
Retirement obligations, net of current portion	3,585	3,601
Pension settlement obligation, net of current portion	3,575	4,042
Long-term debt, net of current portion	1,052	1,303
Total liabilities	19,994	18,975
Commitments and contingencies	0	0
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	54,057	53,967
Common stock in treasury, at cost, 264,350 shares	(3,532)	(3,532)
Accumulated deficit	(44,008)	(42,409)
Accumulated other comprehensive loss	(2,182)	(1,976)
Total stockholders' equity	6,684	8,373
Total liabilities and stockholders' equity	$ 26,678	$ 27,348