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Note 15 - Common Stock (Details Textual)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2016
USD ($)
shares
Apr. 30, 2016
USD ($)
shares
Dec. 05, 2008
Aug. 15, 2008
Aug. 04, 2008
Jul. 03, 2001
shares
Common Class A [Member]            
Stock Repurchased During Period, Shares 0 0        
Common Stock Voting Rights Votes per Share Number   1        
Shareholder Ownership Percentage       4.90%    
Number of Rights       1    
Shareholder Percent of Stock Acquired       4.90%    
Shareholders Pre Existing Ownership Percentage     5.00%      
Shareholders Current Ownership Percentage     5.00%      
Shareholders Ownership Percentage on Transfers     5.00%      
Shareholders Ownership Percentage Threshold     5.00%      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           4,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ $ 0.5 $ 0.5        
Common Class B [Member]            
Common Stock Voting Rights Votes per Share Number   10        
Minimum [Member]            
Shareholder Ownership Percentage         5.00%  
Common Stock Dividends Percent of Increase from Class A to Class B 110.00% 110.00%        
Shareholder Ownership Percentage of Increase         50.00%