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Note 4 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2021 | Nov. 30, 2021 | Nov. 30, 2020
Goodwill, Impairment Loss | $ 0 |  |
Restricted Cash, Current |  | $ 92 | $ 6,389
Restricted Cash, Noncurrent |  | 0 | 92
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  | 10 | 10
Tangible Asset Impairment Charges, Total |  | $ 0 | $ 0
Standard Product Warranty, Term (Year) |  | 1 year |
Extended Product Warranty, Term (Year) |  | 3 years | 3 years
Loss Contingency Accrual, Ending Balance |  | $ 300 |
Advertising Expense |  | 2,700 | $ 1,000
Research and Development Expense, Total |  | 300 | 40
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  | $ 0 | $ 0
Minimum [Member] | Patents [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 15 years |
Minimum [Member] | Computer Equipment and Software [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 3 years |
Minimum [Member] | Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 3 years |
Maximum [Member] | Patents [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 17 years |
Maximum [Member] | Computer Equipment and Software [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 7 years |
Maximum [Member] | Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 7 years |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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