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Note 1 - Summary of Significant Account Policies (Details Textual) - USD ($) | 12 Months Ended
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Nov. 30, 2015 | Nov. 30, 2014
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Maximum [Member] |  |
Concentration Risk, Percentage | 5.00% | 7.00%
Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 40 years |
Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Assets Leased to Others [Member] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Goodwill, Impairment Loss | $ 618,729 | $ 0
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month | 1.50% |
Sales Revenue, Goods, Gross | $ 634,000 | 628,000
Research and Development Expense | 162,000 | 191,000
Advertising Expense | $ 488,000 | $ 511,000

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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