Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Cash flows from operations:
Net income	$ 1,359,894	$ 2,108,929
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation	29,812	34,518
Gain on disposal of property, plant, and equipment	(603,454)
Depreciation expense	558,292	587,792
Amortization expense	0	45,000
Bad debt expense	3,880	0
Deferred income taxes	(97,147)	(33,956)
(Increase) decrease in:
Accounts receivable	309,986	(4,201,297)
Inventories	855,817	435,454
Other current assets	40,991	(156,733)
Increase (decrease) in:
Accounts payable	234,643	368,143
Contracts in progress, net	(1,304,566)	1,966,990
Customer deposits	(36,567)	(244,726)
Income taxes payable	(476,695)	494,949
Accrued expenses	(178,581)	802,745
Net cash provided by operating activities	696,305	2,207,808
Cash flows from investing activities:
Purchases of property, plant, and equipment	(684,809)	(533,123)
Proceeds from sale of Armstrong, IA land and Salem, SD building	835,536
Cash flows from financing activities:
Payments of line of credit to bank		(746,565)
Proceeds from term debt	228,339	2,880,000
Repayment of term debt	(907,939)	(596,753)
Proceeds from the exercise of stock options	30,870	9,110
Net cash provided by (used in) financing activities	(648,730)	1,545,792
Net increase/(decrease) in cash	(113,044)	216,912
Cash at beginning of period	1,546,609	118,924
Cash at end of period	1,433,565	335,836
Cash paid during the period for:
Interest	229,581	331,818
Income taxes	1,234,345	443,926
Universal Harvester [Member]
Cash flows from investing activities:
Purchase of assets		(3,003,565)
Argo Trend [Member]
Cash flows from investing activities:
Purchase of assets	(311,346)
Net cash provided by (used in) investing activities	$ (160,619)	$ (3,536,688)