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Note 7 - Pledged Assets, Notes Payable and Long-Term Debt (Details) - Long-Term Debt (Parentheticals) (USD $)
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9 Months Ended | 12 Months Ended |
|---|---|---|
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Jan. 31, 2014
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Apr. 30, 2013
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| Debt Instrument [Line Items] | ||
| Basis Spread on Variable Rate | 0.50% | |
| Operating Line of Credit, Limit on Borrowing Capacity (in Dollars) | $ 6,000,000 | |
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Pre-reset Interest Rate [Member] | Secured Debt [Member]
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| Debt Instrument [Line Items] | ||
| Basis Spread on Variable Rate | 0.45% | 0.45% |
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Secured Debt [Member]
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| Debt Instrument [Line Items] | ||
| Maturity Date | Sep. 01, 2026 | Sep. 01, 2026 |
| Interest Rate | 1.89% | 1.89% |
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Line of Credit [Member]
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| Debt Instrument [Line Items] | ||
| Basis Spread on Variable Rate | 0.50% | 0.50% |
| Maturity Date | Oct. 30, 2015 | Oct. 30, 2015 |
| Interest Rate | 2.75% | 2.75% |
| Operating Line of Credit, Limit on Borrowing Capacity (in Dollars) | $ 6,000,000 | $ 6,000,000 |
| Operating Line of Credit, Prime Rate | 3.25% | 3.25% |