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Note 5 - Accrued Expenses (Tables) | 3 Months Ended
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Feb. 28, 2013
Schedule of Accrued Liabilities [Table Text Block] |
|  | February 28, 2013 |  | November 30, 2012
Salaries, wages, and commissions |  | $ | 797,124 |  |  | $ | 924,123 |
Accrued warranty expense |  |  | 575,330 |  |  |  | 578,864 |
Other |  |  | 362,031 |  |  |  | 457,253 |
|  | $ | 1,734,485 |  |  | $ | 1,960,240 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration