Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Cash flows from operations:
Net income (loss)	$ (258,312)	$ 819,254
Adjustments to reconcile net income to net cash provided by operating activities:
(Gain) on disposal of property, plant, and equipment		(630,028)
Depreciation expense	212,989	198,753
Bad debt expense (recovery)	(5,966)	5,018
(Increase) decrease in:
Accounts receivable	594,980	32,945
Inventories	(998,188)	201,137
Income taxes receivable	(116,824)
Other current assets	(381,292)	(19,856)
Increase (decrease) in:
Accounts payable	250,684	438,467
Contracts in progress, net	22,243	(536,485)
Customer deposits	1,134,311	1,779,184
Income taxes payable		(457,028)
Accrued expenses	(288,108)	(225,755)
Net cash provided by (used in) operating activities	166,517	1,605,606
Cash flows from investing activities:
Purchases of property, plant, and equipment	(432,032)	(144,325)
Proceeds from sale of Armstrong, IA land and Salem, SD building		835,536
Net cash provided by (used in) investing activities	(432,032)	691,211
Cash flows from financing activities:
Net change in line of credit	452,810
Repayment of term debt	(308,330)	(272,192)
Net cash provided by (used in) financing activities	144,480	(272,192)
Net increase/(decrease) in cash	(121,035)	2,024,625
Cash at beginning of period	207,950	1,546,609
Cash at end of period	85,949	3,571,234
Cash paid during the period for:
Interest	53,939	89,463
Income taxes	$ 32,902	$ 899,200