Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities
Net (loss)/income	$ (440,006)	$ 728,156
Adjustments to reconcile net (loss)/income to net cash (used in) provided by operating activities:
Stock-based compensation expense	57,634	76,464
Depreciation and amortization	129,635	139,218
Deferred tax (benefit)/expense	(462,380)	84,387
Bad debt provision	1,032	1,994
Changes in operating assets and liabilities:
Accounts receivable	492,017	2,376,060
Cost in excess of billings on uncompleted contracts	(268,771)	(158,833)
Inventories	(161,996)	52,769
Other current assets	64,462	(18,380)
Increase (decrease) in operating liabilities:
Billings in excess of costs and estimated earnings on uncompleted contracts	(213,390)	(746,950)
Accounts payable and accrued expenses	(88,790)	784,976
Deferred revenue	122,113	(1,047,039)
Net cash (used in)/provided by operating activities	(768,440)	2,272,822
Cash flows from investing activities:
Capital expenditures	(966,914)	(7,602,327)
Deposits		311,781
Net cash (used in) investing activities	(966,914)	(7,290,546)
Cash flows from financing activities:
Proceeds from stock options exercised	17,700	54,293
Proceeds from long-term debt		6,000,000
Payments of long-term debt	(232,816)	(154,912)
Net cash (used in)/provided by financing activities	(215,116)	5,899,381
Net (decrease)/increase in cash and cash equivalents	(1,950,470)	881,657
Cash and cash equivalents at beginning of period	13,721,324	18,136,527
Cash and cash equivalents at end of period	11,770,854	19,018,184
Supplemental disclosure of cash flow information:
Income taxes paid	25	111,725
Interest paid	$ 52,785	$ 32,299