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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 18, 2020 | Feb. 28, 2021 | Nov. 30, 2020 | Nov. 30, 2020 | Nov. 30, 2019 | Feb. 29, 2020
Number of Operating Segments | 3 |  |  | 3 |  |
Revenues, Total |  |  |  | $ 22,409,123 | $ 22,889,173 |
Inventory Write-down |  |  |  | $ 556,303 | 79,265 |
Accounts Receivable, Threshold Period On International Sales (Day) |  |  |  | 180 days |  |
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month |  |  |  | 1.50% |  |
Operating Lease, Right-of-Use Asset |  |  | $ 27,879 | $ 27,879 |  |
Operating Lease, Liability, Noncurrent |  |  | $ 18,342 | 18,342 |  |
Lease, Cost, Total |  |  |  | $ 23,121 |  |
Operating Lease, Weighted Average Remaining Lease Term (Month) |  |  | 2 years 330 days | 2 years 330 days |  |
Operating Lease, Weighted Average Discount Rate, Percent |  |  | 5.50% | 5.50% |  |
Effective Income Tax Rate Reconciliation, Debt Forgiveness, Paycheck Protection Program Under CARES Act |  |  |  | 8.80% |  |
Contract with Customer, Liability, Revenue Recognized |  |  |  | $ 89,000 | $ 185,000 |
Research and Development Expense, Total |  |  |  | 199,000 | 149,000 |
Advertising Expense |  |  |  | 175,000 | 198,000 |
Operating Lease, Liability, Total |  |  | $ 27,879 | 27,879 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | $ 34,316
Operating Lease, Liability, Total |  |  |  |  |  | $ 34,316
Product [Member] |  |  |  |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  |  | 0 | $ 16,000 |
Other Assets [Member] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | 27,879 | 27,879 |  |
Accrued Expenses [Member] |  |  |  |  |  |
Operating Lease, Liability, Current |  |  | $ 9,537 | $ 9,537 |  |
Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 40 years |  |
Lessor, Capital Lease, Term of Contract (Month) |  |  |  | 3 years |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  | 5 years | 5 years |  |
Maximum [Member] | Assets Leased to Others [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 5 years |  |
Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 3 years |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  | 1 year | 1 year |  |
Minimum [Member] | Assets Leased to Others [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  | 3 years |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |
Number Of Major Customers |  |  |  | 1 | 1 |
Concentration Risk, Percentage |  |  |  | 18.00% | 21.00% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Major Customer [Member] | Maximum [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 6.00% | 10.00% |
Estimated Costs To Complete Material Contract [Member] |  |  |  |  |  |
Revenues, Total |  |  |  | $ 1,300,000 |  |
Estimated Costs On Uncompleted Contracts |  |  | $ 2,800,000 | $ 2,800,000 |  |
Change in Accounting Method Accounted for as Change in Estimate [Member] | Forecast [Member] |  |  |  |  |  |
Revenues, Total |  | $ 1,000,000 |  |  |  |
Inventory Valuation and Obsolescence [Member] |  |  |  |  |  |
Inventory Write-down |  |  | $ 681,000 |  |  |
COVID 19 [Member] |  |  |  |  |  |
Percentage of Workforce in Self-quarantine | 17.00% |  |  |  |  |
Percentage of Workforce Working Remote | 75.00% |  |  |  |  |

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