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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
9 Months Ended 12 Months Ended
Oct. 31, 2016
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 100.00%      
Cash, Uninsured Amount $ 1,100,000 $ 1,100,000 $ 768,222  
Selling, General and Administrative Expenses [Member]        
Shipping, Handling and Transportation Costs   1,800,000 2,000,000 $ 2,200,000
Research and Development Expense   1,300,000 1,300,000 1,400,000
Advertising Expense   $ 237,000 $ 451,000 $ 522,000
Minimum [Member] | Building [Member]        
Property, Plant and Equipment, Useful Life   30 years    
Minimum [Member] | Building Improvements [Member]        
Property, Plant and Equipment, Useful Life   3 years    
Maximum [Member] | Building [Member]        
Property, Plant and Equipment, Useful Life   39 years    
Maximum [Member] | Building Improvements [Member]        
Property, Plant and Equipment, Useful Life   7 years