Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	May 31, 2013	May 31, 2012
Cash flows from operations:
Net income	$ 1,333,500	$ 1,129,479
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	(604,245)
Depreciation expense	370,084	377,578
Amortization expense		30,000
Bad debt expense	3,229
Deferred income taxes	(97,147)	56,952
(Increase) decrease in:
Accounts receivable	408,979	(5,397,295)
Inventories	(492,088)	(559,868)
Other current assets	(28,120)	(124,309)
Increase (decrease) in:
Accounts payable	208,415	1,354,166
Contracts in progress, net	(995,529)	1,612,755
Customer deposits	759,838	1,141,274
Income taxes payable	(622,085)	72,042
Accrued expenses	(279)	393,201
Net cash provided by operating activities	274,364	120,493
Cash flows from investing activities:
Purchases of property, plant, and equipment	(210,269)	(203,129)
Purchase of assets of Universal Harvester		(3,003,565)
Proceeds from sale of Armstrong, IA land and Salem, SD building	835,536
Net cash provided by (used in) investing activities	625,267	(3,206,694)
Cash flows from financing activities:
Net change in line of credit		697,035
Payments of notes payable to bank	(551,307)	(328,204)
Proceeds from term debt	228,339	2,880,000
Proceeds from the exercise of stock options		9,110
Net cash (used in) financing activities	(322,968)	3,257,941
Net increase in cash	576,663	171,740
Cash at beginning of period	1,546,609	118,924
Cash at end of period	2,123,272	290,664
Cash paid during the period for:
Interest	169,202	198,718
Income taxes	1,356,942	436,900
Universal Harvester acquisition:
Inventories		947,760
Equipment, tools and dies		364,053
Goodwill and intagible assets		618,729
Land and Building		1,108,573
Non-Cash Activity: Stock issued for purchase of assets		(35,550)
Cash paid		$ 3,003,565