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Subsequent Events	3 Months Ended
Subsequent Events	Jul. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	7. Subsequent Events: We purchased a building in Olathe, Kansas on August 3, 2011 for approximately $690,000 for the expansion of our offices and future manufacturing. We purchased a building and approximately 4 acres of land for approximately $150,000 for easement rights adjacent to property we already own in Dodge City, Kansas in September 2011.