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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income/(loss) $ 2,003,135 $ (66,173)
Adjustments to reconcile net income/(loss) to net cash (used in)/ provided by operating activities:    
Stock-based compensation expense 370,673 253,739
Depreciation and amortization 444,792 394,720
Deferred tax expense/(benefit) 26,920 158,193
Provision for doubtful accounts 31,187 (89,523)
Changes in operating assets and liabilities:    
Accounts receivable (81,170) (1,013,228)
Costs and estimated earnings in excess of billings on contracts in progress (830,695) (1,016,145)
Inventories 637,177 $ (803,916)
Income taxes - current 511,158  
Other current assets 94,037 $ 76,542
Accounts payable and accrued expenses 1,678,912 929,111
Billings in excess of costs and estimated earnings on contracts in progress (928,290) $ (190,821)
Accrued loss on litigation settlement (4,925,000)  
Deferred revenue (309,267) $ (62,927)
Net cash used in operating activities $ (1,276,431) (1,430,428)
Cash flows from investing activities:    
Release of restricted cash   200,000
Capital expenditures $ (166,846) (306,974)
Net cash (used in)/provided by investing activities $ (166,846) (106,974)
Cash flows from financing activities:    
Net proceeds from stock options exercised   51,100
Payments of long-term debt $ (360,000) (360,000)
Net cash used in financing activities (360,000) (308,900)
Net decrease in cash and cash equivalents (1,803,277) (1,846,302)
Cash and cash equivalents at beginning of period 11,966,863 11,247,560
Cash and cash equivalents at end of period 10,163,586 $ 9,401,258
Supplemental disclosure of cash flow information:    
Income taxes paid 100,000  
Interest paid $ 48,865 $ 56,891