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 |