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Note 1 - Summary of Significant Account Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Nov. 30, 2016 | Nov. 30, 2015
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month | 1.50% |
Goodwill, Impairment Loss | $ 0 | $ 618,729
Sales Revenue, Goods, Gross | 424,000 | 634,000
Research and Development Expense | 140,000 | 162,000
Advertising Expense | $ 420,000 | $ 488,000
Assets Leased to Others [Member] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 40 years |
Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Maximum [Member] |  |
Concentration Risk, Percentage | 8.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Minimum [Member] |  |
Concentration Risk, Percentage |  | 6.00%

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