Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Cash flows from operations:
Net income (loss)	$ 193,498	$ (484,577)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock based compensation	10,692
Depreciation expense	190,661	181,420
Amortization expense	15,000	15,000
Deferred income taxes	38,504	70,000
Changes in assets and liabilities:
Accounts receivable	(1,068,758)	807,660
Inventories	(1,130,456)	(372,131)
Income taxes receivable	(28,097)	(360,645)
Other current assets	(182,151)	(156,488)
Increase (decrease) in:
Accounts payable	1,115,086	(414,043)
Contracts in progress, net	347,410	221,670
Customer deposits	1,827,356	3,312,061
Income taxes payable	(350,997)	(594,816)
Accrued expenses	(264,319)	(208,800)
Net cash provided by operating activities	713,429	2,016,311
Cash flows from investing activities:
Purchases of property, plant, and equipment	(105,601)	(284,869)
Net cash (used in) investing activities	(105,601)	(284,869)
Cash flows from financing activities:
Proceeds from line of credit borrowings	2,945,000	1,523,000
Repayment of line of credit borrowings	(3,191,965)	(3,292,000)
Payments of notes payable to bank	(163,299)	(148,158)
Proceeds from the exercise of stock options		38,951
Net cash (used in) provided by financing activities	(410,264)	(1,878,207)
Net increase (decrease) in cash	197,564	(146,765)
Cash at beginning of period	118,924	317,103
Cash at end of period	316,488	170,338
Supplemental disclosures of cash flow information:
Interest	94,317	98,007
Income taxes	$ 436,900	$ 640,850