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Note 10 - Loan and Credit Agreements (Details Textual)
12 Months Ended
Feb. 13, 2019
USD ($)
Mar. 29, 2018
USD ($)
Sep. 28, 2017
USD ($)
Nov. 30, 2019
USD ($)
Nov. 30, 2018
USD ($)
May 01, 2010
USD ($)
Long-term Debt, Total       $ 2,435,993 $ 2,750,477  
Repayments of Long-term Debt, Total       314,485 219,429  
Term Loan Due October 2037 [Member]            
Long-term Debt, Total       $ 2,435,993 $ 2,517,510  
Debt Instrument, Interest Rate, Stated Percentage       5.00% 5.00%  
Debt Instrument, Periodic Payment, Total       $ 17,271 $ 17,271  
Bank Midwest [Member]            
Long-term Line of Credit, Total       2,578,530    
Line of Credit Facility, Remaining Borrowing Capacity       $ 2,421,470    
Line of Credit, Borrowing Base, Accounts Receivable       75.00%    
Line of Credit, Borrowing Base, Inventory       50.00%    
Debt Instrument, Covenant, Minimum Working Capital Ratio     1.75      
Debt Instrument, Covenant, Minimum Working Capital     $ 5,100,000      
Debt Instrument, Covenant, Maximum Debt to Worth Ratio     1      
Debt Instrument, Covenant, Minimum Tangible Balance Sheet Equity, Percentage     40.00%      
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio     1.25      
Debt Instrument, Covenant, Minimum Debt Service Coverage Ratio, Tolerance     0.1      
Debt Instrument, Covenant, Annual Purchases or Sales Price of Equipment Before Requiring Bank Approval     $ 100,000      
Bank Midwest [Member] | Term Loan Due October 2037 [Member]            
Long-term Debt, Total     2,600,000      
Debt Instrument, Periodic Payment, Total       $ 17,271    
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | United States Department of Agriculture [Member]            
Upfront Guarantee Fee       $ 62,400    
Guarantee Fee, Annual Fee, Percentage       0.50%    
Guarantee Requirement, Personally Guarantee, Shareholders Ownership Percentage       20.00%    
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | J. Ward McConnell Jr. [Member]            
Personally Guaranteed, Percentage of Loan       38.00%    
Personally Guaranteed, Fee, Percentage of Guaranteed Amount       2.00%    
Bank Midwest [Member] | Term Loan Due October 2019 [Member]            
Long-term Debt, Total     600,000      
Repayments of Long-term Debt, Total   $ 600,000        
Repayments of Long-term Debt, Principal   596,563        
Repayments of Long-term Debt, Interest   $ 2,328        
Bank Midwest [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 5,000,000      
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Line of Credit Facility, Interest Rate During Period       6.00%    
Debt Instrument, Interest Rate, Effective Percentage 4.25%          
Bank Midwest [Member] | Revolving Credit Facility [Member] | Wall Street Journal Rate [Member]            
Long-term Line of Credit, Total $ 4,000,000          
Debt Instrument, Basis Spread on Variable Rate       1.00%    
Line of Credit Facility, Interest Rate During Period       4.25%    
Debt Instrument, Interest Rate, Effective Percentage 5.75%          
Bank Midwest [Member] | Term Loan Due October 2037 [Member]            
Debt Instrument, Interest Rate, Stated Percentage       5.00%    
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | Minimum [Member]            
Debt Instrument, Interest Rate, Effective Percentage       4.15%    
Bank Midwest [Member] | Term Loan Due October 2037 [Member] | Wall Street Journal Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate       0.75%    
The First National Bank of West Union [Member] | Iowa Finance Authority Term Loan [Member]            
Debt Instrument, Face Amount           $ 1,300,000