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Note 7 - Long-term Debt and Note Payable to Bank (Details Textual)
1 Months Ended 12 Months Ended
Jan. 25, 2016
USD ($)
Jan. 24, 2016
Oct. 31, 2015
USD ($)
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Oct. 31, 2014
USD ($)
Virginia Real Estate Loan [Member]              
Debt Instrument, Interest Rate, Stated Percentage     4.25%       4.25%
The Commercial Loan [Member] | Scenario, Forecast [Member]              
Debt Service Coverage Ratio, Minimum       1.5 1.5 1.25  
The Commercial Loan [Member]              
Debt Instrument, Interest Rate, Stated Percentage     2.39%        
North Carolina Real Estate Loan [Member]              
Debt Instrument, Interest Rate, Stated Percentage     4.25%       4.25%
Certain Receivables Aged Ninety Days or Over [Member] | Revolving Credit Facility [Member] | The Commercial Loan [Member]              
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Related Category Used For Calculation     85.00%        
Line of Credit Facility, Maximum Borrowing Capacity, Maximum Aging of Receivables     90 days        
Certain Foreign Receivables [Member] | Revolving Credit Facility [Member] | The Commercial Loan [Member]              
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Related Category Used For Calculation     35.00%        
Line of Credit Facility, Maximum Amount Outstanding During Period     $ 1,000,000        
Certain Raw Materials of Inventory [Member] | Revolving Credit Facility [Member] | The Commercial Loan [Member]              
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Related Category Used For Calculation     25.00%        
Revolving Credit Facility [Member] | The Commercial Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]              
Debt Instrument, Basis Spread on Variable Rate 2.75% 2.20%          
Line of Credit Facility, Commitment Fee Amount $ 25,000            
Revolving Credit Facility [Member] | The Commercial Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.20%        
Revolving Credit Facility [Member] | The Commercial Loan [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 9,000,000        
Long-term Line of Credit     6,000,000       $ 2,500,000
Line of Credit Facility, Remaining Borrowing Capacity     2,600,000       $ 6,500,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months     280,999        
Long-term Debt, Maturities, Repayments of Principal in Year Two     6,294,214        
Long-term Debt, Maturities, Repayments of Principal in Year Three     $ 6,651,794        
Revolving Credit Facility [Member] | North Carolina Real Estate Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member]              
Line of Credit Facility, Commitment Fee Amount $ 10,000            
Debt Service Coverage Ratio, Minimum     1.5        
Debt Service Coverage Ratio     1.08