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Note 6 - Long-term Debt and Note Payable to Bank - Long-term Debt (Details) (Parentheticals) - USD ($)
6 Months Ended 12 Months Ended
Apr. 30, 2016
Oct. 31, 2015
Jan. 31, 2016
Virginia Real Estate Loan [Member]      
Original principal $ 6,500,000 $ 6,500,000  
Monthly installments $ 36,426 $ 36,426  
Debt Instrument, Interest Rate, Stated Percentage 4.25% 4.25%  
Final payment $ 4,858,220 $ 4,858,220  
Maturity date Apr. 30, 2018 Apr. 30, 2018  
North Carolina Real Estate Loan [Member]      
Original principal $ 2,240,000 $ 2,240,000  
Monthly installments $ 12,553 $ 12,553  
Debt Instrument, Interest Rate, Stated Percentage 4.25% 4.25% 4.25%
Final payment $ 1,674,217 $ 1,674,217  
Maturity date Apr. 30, 2018 Apr. 30, 2018