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Consolidated Balance Sheets Unaudited Parenthetical (USD $)
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Apr. 30, 2013
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Jul. 31, 2012
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|---|---|---|
| Assets | ||
| Property, building and equipment, accumulated depreciation | $ 24,220,809 | $ 22,584,958 |
| Shareholders' equity: | ||
| Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Preferred stock, authorized (in shares) | 2,000,000 | 2,000,000 |
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Class A [Member]
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| Shareholders' equity: | ||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, authorized (in shares) | 6,000,000 | 6,000,000 |
| Common stock, issued (in shares) | 2,685,151 | 2,685,151 |
| Treasury Stock (in shares) | 77,724 | 84,730 |
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Class B [Member]
|
||
| Shareholders' equity: | ||
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, authorized (in shares) | 10,000,000 | 10,000,000 |
| Common stock, issued (in shares) | 1,708,574 | 1,708,574 |
| Treasury Stock (in shares) | 64,801 | 64,801 |