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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:    
Net income (loss) before dividends on redeemable convertible preferred stock $ (2,228) $ (7,060)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:    
Deferred income tax provision (benefit) (3,033) (75)
Equity income from foreign joint ventures’ operations (656) (529)
Depreciation and amortization 841 877
Stock based compensation 373 563
Bad debt expense (127) 214
Obsolete inventory expense 66 40
(Gain)/loss on sale of property and equipment   (75)
Deferred compensation costs (47) (45)
Amortization of debt issuance costs 86  
Change in operating assets and liabilities:    
Accounts receivable 750 (1,111)
Inventories (212) 104
Costs and estimated earnings in excess of billings on uncompleted contracts (787) (3,008)
Prepaid expenses and other current assets (208) 33
Accounts payable 3,159 4,327
Billings in excess of costs and estimated earnings on uncompleted contracts 1,584 (1,421)
Accrued liabilities and other current liabilities (244) 566
Net cash (used in) provided by operating activities (683) (6,600)
Cash flows from investing activities:    
Proceeds from sales of property and equipment and other assets   309
Purchases of property, plant and equipment and other assets (410) (725)
Proceeds from foreign joint ventures’ operations dividends 781 589
Redemption (purchase) of certificates of deposit 457  
Net cash provided by from investing activities 828 173
Cash flows from financing activities:    
Proceeds from sale of common stock, preferred stock, and warrants 10 18
Treasury stocks purchase (53) (71)
Preferred stock cash dividend   (75)
Proceeds from long-term notes payable 7,000  
Proceeds from short-term notes payable 200  
Payments on revolving credit facility (1,500) 457
Payments on long-term notes payable (4,200) (300)
Payments on short-term notes payable (500)  
Payments of debt issuance costs (427)  
Net cash provided by financing activities 530 29
Effect of exchange rates on cash (4) 27
Net (decrease) increase in cash and cash equivalents 671 (6,371)
Cash and cash equivalents, beginning of period 1,618 7,989
Cash and cash equivalents, end of period 2,289 1,618
Supplemental disclosures of cash flow information:    
Interest paid 772 235
Income taxes paid 78 $ 60
Non-cash investing and financing transactions:    
Warrants issued as part of debt refinancing 365  
Issuance of shares of common stock on accrued preferred dividends payables $ 450