Note 6 - Product Warranty (Detail) - Changes In Product Warranty Liability (USD $)	3 Months Ended	9 Months Ended
Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Balance, beginning	$ 277,965	$ 199,395	$ 201,630	$ 180,549
Settlements made in cash or in-kind	(94,065)	(123,457)	(270,784)	(315,621)
Warranties issued	313,898	174,845	566,952	385,855
Balance, ending	$ 497,798	$ 250,783	$ 497,798	$ 250,783

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 14

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration