Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Cash flows from operations:
Net income	$ 1,248,895	$ 1,053,497
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation	58,311	28,322
Depreciation expense	720,169	655,885
Amortization expense	60,000	60,000
Bad debt expense (recoveries)	(19,995)	40,293
Deferred income taxes	130,407	16,000
(Increase) decrease in:
Accounts receivable	483,250	(185,961)
Inventories	546,711	(299,778)
Other current assets	46,844	793,128
Other, net		10,901
Increase (decrease) in:
Accounts payable	(666,950)	569,561
Contracts in progress, net	124,490	(102,274)
Customer deposits	(102,404)	191,610
Income taxes payable	(243,820)	172,611
Accrued expenses	(17,822)	589,717
Net cash provided by operating activities	2,368,086	3,593,512
Purchases of property, plant, and equipment	(859,324)	(2,043,284)
Net change in asset held for lease	(232,861)	(319,091)
Purchase of assets of Roda		(1,158,862)
Purchase of assets of M&W		(427,198)
Net cash (used in) investing activities	(1,092,185)	(3,948,435)
Proceeds from (repayments of) line of credit borrowings, net	(695,035)	(354,892)
Payments of notes payable to bank	(611,923)	(514,520)
Proceeds from term debt		1,313,000
Proceeds from the exercise of stock options	74,429	81,240
Dividends paid to stockholders	(241,551)	(240,020)
Net cash (used in) provided by financing activities	(1,474,080)	284,808
Net increase (decrease) in cash	(198,179)	(70,115)
Cash at beginning of period	317,103	387,218
Cash at end of period	118,924	317,103
Cash paid/(received) during the period for:
Interest	432,131	415,267
Income taxes	485,144	315,063
Transfer of building from inventory to asset held for lease		319,091
Roda acquisition:
Property, plant and equipment		7,355
Prepaid Expenses		10,901
Roda Aquisition [Member]
Roda acquisition:
Inventories Acquired		1,140,606
MW Acquisition [Member] | MW Acquisition [Member]
Roda acquisition:
Total Cash Paid For Acquired Assets		427,198
MW Acquisition [Member]
Roda acquisition:
Inventories Acquired		427,198
Roda Aquisition [Member]
Roda acquisition:
Total Cash Paid For Acquired Assets		$ 1,158,862