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Note 7 - Loan and Credit Agreements (Detail) (USD $)
1 Months Ended 3 Months Ended 3 Months Ended
Jun. 30, 2009
Feb. 28, 2013
Nov. 30, 2012
May 31, 2012
May 10, 2012
Sep. 15, 2010
May 31, 2010
Nov. 30, 2007
Oct. 09, 2007
Jun. 07, 2007
Apr. 26, 2012
West Bank [Member]
Term Loan [Member]
Apr. 26, 2012
West Bank [Member]
Monona and Dubuque [Member]
May 31, 2012
West Bank [Member]
Feb. 28, 2013
US Bank [Member]
Nov. 30, 2012
US Bank [Member]
May 10, 2012
US Bank [Member]
Apr. 26, 2012
West Bank [Member]
Apr. 26, 2012
Dubuque Construction [Member]
Jun. 30, 2009
IDED Note 1 [Member]
Jun. 30, 2009
IDED Note 2 [Member]
Feb. 28, 2013
Iowa Finance Authority [Member]
Line of Credit Facility, Maximum Borrowing Capacity   $ 6,000,000                                      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum   4.00%                                      
Line of Credit Facility, Remaining Borrowing Capacity   6,000,000 6,000,000                                    
Line of Credit Facility, Borrowing Capacity, Description   60%                                      
Long-term Debt   8,193,941 8,466,134 2,000,000 880,000 13,000 1,300,000     4,100,000   1,074,000   794,989 823,555   2,659,000 1,221,000 95,000 95,000 998,000
Term Loan Final Payment                     536,000 628,000 666,000     283,500   711,000      
Debt Instrument, Face Amount                 1,330,000                        
Construction Loan               1,500,000                          
Debt Instrument, Interest Rate, Stated Percentage 0.00%           3.50%             3.15% 3.15%            
Debt Instrument, Frequency of Periodic Payment 60                                        
Debt Instrument, Periodic Payment $ 1,583                         $ 11,700 $ 11,700