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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Nov. 30, 2023 USD ($) | Nov. 30, 2022 USD ($) | Dec. 01, 2021 USD ($)
Number of Operating Segments | 3 |  |
Accounts Receivable, Threshold Period On International Sales (Year) | 180 years |  |
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month | 1.50% |  |
Lease, Cost | $ 17,459 | $ 17,366 |
Operating Lease, Weighted Average Remaining Lease Term (Month) | 30 months |  |
Operating Lease, Weighted Average Discount Rate, Percent | 4.75% |  |
Lessee, Finance Lease, Term of Contract (Month) | 45 months |  |
Lessee, Finance Lease, Discount Rate | 5.19% |  |
Finance Lease, Right-of-Use Asset, Amortization | $ 129,891 | 110,426 |
Contract with Customer, Liability, Revenue Recognized | 1,153,000 | 558,000 |
Construction Contractor, Receivable, Excluding Contract Retainage | 3,432,000 | 2,466,790 | $ 2,380,000
Contract with Customer, Asset, after Allowance for Credit Loss | 289,000 | 451,000 | 177,000
Contract with Customer, Liability | 767,000 | 1,153,000 | $ 558,000
Research and Development Expense | 204,000 | 193,000 |
Advertising Expense | 229,000 | 190,000 |
Internal Use Software [Member] | Operating Expense [Member] | Implementation Costs [Member] |  |  |
Amortization of Intangible Assets | 30,000 |  |
Internal Use Software [Member] | Operating Expense [Member] | Noncapitalized Implementation Costs [Member] |  |  |
Research and Development Expense, Software (Excluding Acquired in Process Cost) | 58,000 | 26,000 |
Other Current Assets [Member] | Internal Use Software [Member] |  |  |
Finite-Lived Intangible Assets, Net | 183,000 |  |
Product [Member] |  |  |
Contract with Customer, Liability, Revenue Recognized | $ 3,110,000 | $ 1,010,000 |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 40 years |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |
Number of Major Customers | 1 |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |
Concentration Risk, Percentage | 12.00% | 11.00% |

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