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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities    
Net income $ 1,465,864 $ 13,435
Stock-based compensation expense 144,031 87,652
Depreciation and amortization 276,738 305,284
Deferred tax expense (benefit) 74,076 (70,377)
Bad debt provision 711 (2,321)
Accounts receivable (907,124) 510,461
Cost and estimated earnings in excess of billings on uncompleted contracts 125,890 1,660,411
Inventories, net 474,707 (195,431)
Other current assets (53,471) (81,969)
Customer deposits (24,478)  
Billings in excess of costs and estimated earnings on uncompleted contracts 3,641,223  
Accounts payable and accrued expenses 1,166,180 (54,717)
Deferred revenue 156,138 (113,948)
Net cash provided by operating activities 6,540,485 2,058,480
Cash flows from investing activities:    
Capital expenditures (100,066) (254,377)
Net cash (used in) investing activities (100,066) (254,377)
Cash flows from financing activities:    
Net proceeds from issuance of common stock (Note 9) 9,391,967  
Net proceeds from stock options exercised 4,520  
Payments of long-term debt (371,598) (181,535)
Net cash provided by (used in) financing activities 9,024,889 (181,535)
Net increase in cash and cash equivalents 15,465,308 1,622,568
Cash and cash equivalents at beginning of period 6,249,090 3,119,731
Cash and cash equivalents at end of period 21,714,398 4,742,299
Income taxes paid 505,100 13,338
Interest paid $ 102,655 $ 116,223