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Note 8 - Loan and Credit Agreements (Details Textual)
9 Months Ended 12 Months Ended
Jul. 11, 2016
USD ($)
Feb. 10, 2016
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Nov. 30, 2015
USD ($)
May 29, 2014
USD ($)
May 01, 2013
USD ($)
Feb. 01, 2013
May 10, 2012
USD ($)
May 01, 2010
USD ($)
US Bank [Member] | Line of Credit, 2013 Term Notes, and 2014 Term Notes [Member]                    
Debt Instrument, Covenant Year-to-Date Fixed Charge Coverage Ratio     1              
Debt Instrument, Covenant Quarterly Fixed Charge Coverage Ratio     1.15              
Debt Instrument, Covenant EBITDA Amount, Period One     $ 360,000              
Debt Instrument, Covenant EBITDA Amount, Period Two     390,000              
Debt Instrument, Covenant EBITDA Amount, Period Three     395,000              
Debt Instrument, Covenant EBITDA Amount, Period Four     400,000              
Debt Instrument, Covenant Monthly Minimum Liquidity Amount     $ 750,000              
US Bank [Member] | The Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member]                    
Debt Instrument, Interest Rate, Stated Percentage     5.00%              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%              
US Bank [Member] | The Line of Credit [Member] | Revolving Credit Facility [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity             $ 5,000,000      
Long-term Line of Credit     $ 3,434,114              
Line of Credit Facility, Remaining Borrowing Capacity     $ 1,565,886              
Line of Credit Facility Borrowing Capacity Borrowing Base Percentage of Accounts Receivable     75.00%              
Line of Credit Facility Borrowing Capacity Borrowing Base Minimum Percentage of Aggregate Receivables     20.00%              
Line of Credit Facility Borrowing Capacity Borrowing Base Percentage of Inventory     50.00%              
Line of Credit Facility Borrowing Capacity Borrowing Base Maximum Inventory Amount     $ 3,750,000              
US Bank [Member] | US Bank UHC Loan [Member]                    
Debt Instrument, Interest Rate, Stated Percentage     3.15%              
Debt Instrument, Face Amount                 $ 880,000  
Term Loan Final Payment                 $ 283,500  
Long-term Debt     $ 369,378              
US Bank [Member] | The 2013 Term Notes [Member]                    
Debt Instrument, Interest Rate, Stated Percentage     2.98%              
Long-term Debt     $ 2,293,094              
Repayments of Long-term Debt   $ 1,078,196                
Debt Instrument, Periodic Payment     51,350              
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid     $ 1,363,000              
US Bank [Member] | The 2014 Term Note [Member]                    
Debt Instrument, Interest Rate, Stated Percentage     2.98%              
Debt Instrument, Face Amount           $ 1,000,000        
Long-term Debt     $ 914,480              
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid     $ 890,000              
US Bank [Member] | US Bank UHC Loan, Line of Credit, 2013 Term Notes, and 2014 Term Notes [Member]                    
Debt Instrument, Covenant Interest Rate Increase in Event of Default     5.00%              
US Bank [Member]                    
Line of Credit Facility, Capacity Available, Terminated $ 200,000                  
The First National Bank of West Union [Member] | Iowa Finance Authority Term Loan [Member]                    
Debt Instrument, Interest Rate, Stated Percentage               2.75%   3.50%
Debt Instrument, Face Amount                   $ 1,300,000
Debt Instrument, Covenant Debt Service Coverage Ratio     1.5              
Iowa Finance Authority Term Loan [Member]                    
Debt Instrument, Interest Rate, Stated Percentage     2.75%   2.75%          
Long-term Debt     $ 546,815   $ 647,132          
Debt Instrument, Periodic Payment     12,500   12,500          
Long-term Debt     4,123,767   $ 5,949,329          
Repayments of Long-term Debt     $ 1,730,774 $ 867,642