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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%