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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:    
Net income $ 3,779,123 $ 531,772
Adjustments to reconcile net income to net cash provided by (used in) operating activities    
Depreciation and amortization 597,040 588,987
Stock-based compensation 290,598 172,490
Deferred income taxes 433,179 76,936
Bad debt provision 6,449 (37,677)
(Increase)/decrease in operating assets    
Accounts receivable (760,855) (741,300)
Cost in excess of billings on uncompleted contracts (1,752,135) 1,049,395
Inventories, net 760,390 (211,724)
Other current assets (14,534) 77,324
Increase/(decrease) in operating liabilities    
Billings in excess of costs and estimated earnings on uncompleted contracts (636,481) 2,323,691
Accounts payable 141,224 (232,797)
Accrued expenses 354,180 261,316
Deferred revenue 989,593 (51,141)
Total adjustments 408,648 3,275,500
Net cash provided by operating activities 4,187,771 3,807,272
Cash flows from investing activities:    
Restricted cash (1,000,000)  
Capital expenditures (204,935) (373,731)
Deposits (360,000)  
Net cash (used in) investing activities (1,564,935) (373,731)
Cash flows from financing activities    
Net proceeds from issuance of common stock (Note 12) 9,387,666  
Net proceeds from stock options exercised 473,973 63,850
Proceeds from long-term debt 2,100,000  
Payments of long-term debt (2,697,038) (368,032)
Net cash provided by (used in) financing activities 9,264,601 (304,182)
Net increase in cash and cash equivalents 11,887,437 3,129,359
Cash and cash equivalents at beginning of year 6,249,090 3,119,731
Cash and cash equivalents at end of year 18,136,527 6,249,090
Supplemental disclosure of cash flow information:    
Income taxes paid 813,336 40,048
Interest paid $ 182,969 $ 226,559