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Note 6 - Long-term Debt and Note Payable to Bank (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Apr. 26, 2016
BNC [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 7.0
Long-term Line of Credit $ 4.6    
Line of Credit Facility, Remaining Borrowing Capacity $ 2.4    
BNC [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 2.50%    
Debt Instrument, Interest Rate, Effective Percentage 3.16%    
BNC [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument, Interest Rate, Effective Percentage 2.50%    
Virginia Real Estate Loan [Member]      
Debt Instrument, Interest Rate, Stated Percentage 3.75% 4.25%  
Virginia Real Estate Loan [Member] | BNC [Member]      
Debt Instrument, Interest Rate, Stated Percentage 3.75%    
The Commercial Loan [Member] | BNC [Member] | Revolving Credit Facility [Member]      
Long-term Line of Credit   $ 5.0  
Line of Credit Facility, Remaining Borrowing Capacity   $ 2.0  
North Carolina Real Estate Loan [Member]      
Debt Instrument, Interest Rate, Stated Percentage 3.75% 4.25%  
North Carolina Real Estate Loan [Member] | BNC [Member]      
Debt Instrument, Interest Rate, Stated Percentage 3.75%