Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net income	$ 728,156	$ 687,424
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	76,464	68,828
Depreciation and amortization	139,218	137,026
Deferred tax benefit	84,387	3,778
Bad debt provision	1,994	487
Changes in operating assets and liabilities:
Accounts receivable	2,376,060	(1,086,053)
Cost in excess of billings on uncompleted contracts	(158,833)	(1,073,397)
Inventories, net	52,769	469,681
Other current assets	(18,380)	(23,898)
Increase (decrease) in operating liabilities:
Billings in excess of costs and estimated earnings on uncompleted contracts	(746,950)	4,413,501
Accounts payable and accrued expenses	784,976	788,395
Deferred revenue	(1,047,039)	398,776
Net cash provided by operating activities	2,272,822	4,784,548
Cash flows from investing activities:
Capital expenditures	(7,602,327)	(57,733)
Deposits	311,781
Net cash (used in) investing activities	(7,290,546)	(57,733)
Cash flows from financing activities:
Net proceeds from stock options exercised	54,293	(44,038)
Proceeds from long-term debt	6,000,000
Payments of long-term debt	(154,912)	(305,314)
Net cash provided by (used in) financing activities	5,899,381	(349,352)
Net increase in cash and cash equivalents	881,657	4,377,463
Cash and cash equivalents at beginning of period	18,136,527	6,249,090
Cash and cash equivalents at end of period	19,018,184	10,626,553
Supplemental disclosure of cash flow information:
Income taxes paid	111,725	305,100
Interest paid	$ 32,299	$ 53,732