Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Cash flows from operations:
Net income	$ 819,254	$ 193,498
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation		10,692
(Gain) on disposal of property, plant, and equipment	(630,028)
Depreciation expense	198,753	190,661
Amortization expense		15,000
Bad debt expense	5,018
Deferred income taxes		38,504
(Increase) decrease in:
Accounts receivable	32,945	(1,068,758)
Inventories	201,137	(1,130,456)
Income taxes receivable		(28,097)
Other current assets	(19,856)	(182,151)
Increase (decrease) in:
Accounts payable	438,467	1,115,086
Contracts in progress, net	(536,485)	347,410
Customer deposits	1,779,184	1,827,356
Income taxes payable	(457,028)	(350,997)
Accrued expenses	(225,755)	(264,319)
Net cash provided by operating activities	1,605,606	713,429
Cash flows from investing activities:
Purchases of property, plant, and equipment	(144,325)	(105,601)
Proceeds from sale of Armstrong, IA land and Salem, SD building	835,536
Net cash provided by (used in) investing activities	691,211	(105,601)
Cash flows from financing activities:
Net change in line of credit		(246,965)
Payments of notes payable to bank	(272,192)	(163,299)
Net cash (used in) financing activities	(272,192)	(410,264)
Net increase in cash	2,024,625	197,564
Cash at beginning of period	1,546,609	118,924
Cash at end of period	3,571,234	316,488
Cash paid during the period for:
Interest	89,463	94,317
Income taxes	$ 899,200	$ 436,900