XML 54 R42.htm IDEA: XBRL DOCUMENT v3.24.0.1
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%