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Note 7 - Pledged Assets, Notes Payable and Long-Term Debt (Details) (USD $)
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9 Months Ended |
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Jan. 31, 2014
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| Note 7 - Pledged Assets, Notes Payable and Long-Term Debt (Details) [Line Items] | |
| Number Of Credit Agreements | 2 |
| Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) | $ 6,000,000 |
| Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) | $ 4,726,000 |
| Debt Instrument, Basis Spread on Variable Rate | 0.50% |
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Line of Credit [Member] | Prime Rate [Member]
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| Note 7 - Pledged Assets, Notes Payable and Long-Term Debt (Details) [Line Items] | |
| Debt Instrument, Interest Rate, Reference Rate | 3.25% |
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Line of Credit [Member]
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| Note 7 - Pledged Assets, Notes Payable and Long-Term Debt (Details) [Line Items] | |
| Line of Credit Facility, Interest Rate at Period End | 2.75% |