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Note 7 - Loan and Credit Agreements (Details Textual)
3 Months Ended
Feb. 10, 2016
USD ($)
Jul. 16, 2015
USD ($)
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
Nov. 30, 2015
May. 29, 2014
USD ($)
May. 01, 2013
USD ($)
Feb. 01, 2013
May. 10, 2012
USD ($)
May. 01, 2010
USD ($)
US Bank New Loans [Member]                    
Debt Instrument, Face Amount             $ 6,319,000      
Debt Instrument, Interest Rate, Stated Percentage             2.98%      
Number of Notes Paid Off and Terminated 1                  
Repayments of Long-term Debt $ 1,078,196                  
Debt Instrument Covenant Debt to Tangible Net Worth Ratio         1.5          
Debt Instrument Covenant Fixed Charge Coverage Ratio         1.15          
Debt Instrument Covenant Interest Rate Increase in Event of Default         5.00%          
US Bank [Member]                    
Debt Instrument, Face Amount           $ 1,000,000     $ 880,000  
Term Loan Final Payment           $ 890,000     $ 283,500  
Debt Instrument Covenant Interest Rate Increase in Event of Default         5.00%          
The 2015 Line of Credit [Member] | US Bank [Member]                    
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,500,000                
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum   3.50%                
Line of Credit Facility, Interest Rate at Period End         3.50%          
Long-term Line of Credit     $ 0              
Line of Credit Facility, Remaining Borrowing Capacity     1,500,000              
The 2015 Line of Credit [Member]                    
Debt Instrument Covenant Interest Rate Increase in Event of Default         10.00%          
Iowa Finance Authority [Member]                    
Debt Instrument, Face Amount                   $ 1,300,000
Debt Instrument, Interest Rate, Stated Percentage               2.75%   3.50%
Debt Instrument Covenant Debt Service Coverage Ratio               1.5    
Line of Credit Facility, Maximum Borrowing Capacity     $ 8,000,000              
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum     3.50%              
Line of Credit Facility, Interest Rate at Period End     3.50%              
Long-term Line of Credit     $ 3,790,175              
Line of Credit Facility, Remaining Borrowing Capacity     $ 3,523,220              
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     $ 6,000,000              
Repayments of Long-term Debt     1,404,080 $ 316,909            
Debt Instrument, Periodic Payment     51,350              
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid     $ 1,363,000