Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Cash flows from operations:
Net income	$ 826,002	$ 886,707
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation	58,311	19,978
Depreciation expense	560,931	491,973
Amortization expense	45,000	45,000
Deferred income taxes	115,312	35,000
(Increase) decrease in:
Accounts receivable	(851,843)	(778,985)
Inventories	659,216	(418,009)
Other current assets	(52,189)	735,981
Increase (decrease) in:
Accounts payable	(309,943)	623,567
Contracts in progress, net	555,649	103,669
Customer deposits	(155,121)	248,757
Income taxes payable	(539,276)	126,630
Accrued expenses	(60,532)	817,654
Net cash provided by operating activities	851,518	2,937,922
Cash flows from investing activities:
Purchases of property, plant, and equipment	(730,326)	(1,921,608)
Net change in asset held for lease	(229,095)
Purchase of assets of Roda		(1,179,001)
Purchase of assets of M&W		(453,161)
Net cash (used in) investing activities	(959,421)	(3,553,770)
Cash flows from financing activities:
Net change in line of credit	391,387	(166,892)
Payments of notes payable to bank	(453,443)	(367,369)
Proceeds from term debt		1,300,000
Proceeds from the exercise of stock options	66,749	7,503
Net cash provided by financing activities	4,693	773,242
Net (increase) decrease in cash	(103,210)	157,394
Cash at beginning of period	317,103	387,218
Cash at end of period	213,893	544,612
Cash paid/(received) during the period for:
Interest	321,921	301,980
Income taxes	$ 665,203	$ 315,063