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Note 1 - Nature of Business and Significant Accounting Policies (Detail) (USD $) | 12 Months Ended
--- | ---
Aug. 31, 2012 | Aug. 31, 2011
Number of Countries in which Entity Operates | 55 |
Deferred Revenue, Current (in Dollars) | $ 288,000 | $ 288,000
Allowance for Doubtful Accounts Receivable (in Dollars) | 20,000 | 20,000
Reimbursements Related to Certain Research and Development Contracts (in Dollars) | 365,940 | 219,175
Other Accrued Liabilities, Current (in Dollars) | 251,350 | 182,916
Zerust Brazil [Member] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 15.00% |
Equity Method Investment, Ownership Percentage | 85.00% |
Research and Development Contracts [Member] |  |
Other Accrued Liabilities, Current (in Dollars) | 96,861 | 0
Building and Building Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 30 years |
Building and Building Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Machinery and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 10 years |
Machinery and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Joint Venture Fees [Member] |  |
Deferred Revenue, Current (in Dollars) | $ 288,000 | $ 288,000
Maximum [Member] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 50.00% |

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