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Note 6 - Long-term Debt and Note Payable to Bank (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Jul. 31, 2017
Apr. 27, 2017
Apr. 26, 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 $ 5.4        
Line of Credit Facility, Remaining Borrowing Capacity $ 1.6        
BNC [Member] | Revolving Credit Facility [Member] | Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.50%        
BNC [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Interest Rate, Effective Percentage 3.72%        
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 3.95%     3.95%  
Virginia Real Estate Loan [Member] | BNC [Member]          
Debt Instrument, Interest Rate, Stated Percentage   3.95% 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