CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash	$ 1,906	$ 3,939
Short term investment (certificate of deposit)	1,017	1,017
Accounts receivable, net of allowance of $10	5,510	4,142
Costs and estimated earnings in excess of billings on uncompleted contracts	259	925
Prepaid expenses and other current assets	238	302
Total current assets	8,930	10,325
Property, plant and equipment, net	12,267	12,352
Intangibles, net	61	63
Other assets	1,189	1,230
Total assets	22,447	23,970
Current liabilities:
Accounts payable and accrued liabilities	1,273	1,511
Billings in excess of costs and estimated earnings on uncompleted contracts	107	612
Current portion of long-term debt	11	0
Total current liabilities	1,391	2,123
Long-term debt	55	0
Total liabilities	1,446	2,123
Stockholders' equity:
Preferred stock, $0.001 par value, 10,000,000 shares authorized, 0 shares issued and outstanding	0	0
Common stock, $0.001 par value, 24,500,000 shares authorized, 15,438,660 shares issued	15	15
Treasury stock, 2,002,417 shares	(2,040)	(2,040)
Additional paid-in capital	73,251	73,246
Accumulated deficit	(50,225)	(49,374)
Total stockholders' equity	21,001	21,847
Total liabilities and stockholders' equity	$ 22,447	$ 23,970