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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities    
Net loss $ (268,147) $ (440,006)
Adjustments to reconcile net (loss) to net cash provided by/(used in) operating activities:    
Stock-based compensation expense 137,999 57,634
Depreciation and amortization 196,837 129,635
Deferred tax expense/(benefit) 219,380 (462,380)
Bad debt provision (97,496) 1,032
Changes in operating assets and liabilities:    
Accounts receivable 1,022,478 492,017
Cost in excess of billings on uncompleted contracts (356,416) (268,771)
Inventories (458,141) (161,996)
Other current assets 97,320 64,462
Billings in excess of costs and estimated earnings on uncompleted contracts 144,274 (213,390)
Accounts payable and accrued expenses 357,635 (88,790)
Deferred revenue (204,527) 122,113
Net cash provided by (used in) operating activities 791,196 (768,440)
Cash flows from investing activities:    
Release of restricted cash 200,000  
Capital expenditures (141,325) (966,914)
Net cash provided by (used in) investing activities 58,675 (966,914)
Cash flows from financing activities:    
Proceeds from stock options exercised 51,100 17,700
Payments of long-term debt (180,000) (232,816)
Net cash used in financing activities (128,900) (215,116)
Net increase (decrease) in cash and cash equivalents 720,971 (1,950,470)
Cash and cash equivalents at beginning of period 11,247,560 13,721,324
Cash and cash equivalents at end of period 11,968,531 11,770,854
Income taxes paid 1,622 25
Interest paid $ 29,015 $ 52,785