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Note 8 - Shareholders' Equity (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2012 | Jan. 31, 2011 | Jan. 31, 2010 | Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010 | Sep. 29, 2010 | Apr. 30, 2004
Preferred Stock, Liquidation Preference Per Share (in Dollars per share) |  |  |  | $ 1.00 |  |  |  |
Preferred Stock, Redemption Price Per Share (in Dollars per share) |  |  |  | $ 1.00 |  |  |  |
Preferred Stock, Dividend Payment Terms |  |  |  | $36,026,232 |  |  |  |
Dividends, Preferred Stock (in Dollars) |  |  |  | $ 432,513 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  |  |  |  |  | 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  |  | 1,350,811 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in Shares) |  |  |  | 29,500 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period (in Shares) |  |  |  | 48,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year | 12500 years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  | 12,500 |  |  |  |
Share Based Compensation Expiration | 10 years |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value (in Dollars) | 15,400 |  |  | 66,000 | 74,700 | 79,700 |  |
Fair Value Assumptions, Exercise Price (in Dollars per share) | $ 1.85 | $ 3.67 | $ 2.88 |  |  |  |  |
Fair Value Assumptions, Expected Term | 10 years | 10 years | 10 years |  |  |  |  |
Fair Value Assumptions, Expected Dividend Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.87% | 3.37% | 3.74% |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate | 73.20% | 84.70% | 88.40% |  |  |  |  |
Fair Value Expected Foreiture Rate | 0.00% | 0.00% | 0.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ 15,400 | $ 54,500 | $ 31,200 | $ 1.23 | $ 3.11 | $ 2.49 |  |
Share Price (in Dollars per share) |  |  | $ 2.49 | $ 2.35 |  |  | $ 3.00 |
Allocated Share-based Compensation Expense (in Dollars) |  |  |  | 54,600 | 94,600 | 87,600 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) |  |  |  | 92 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item) |  |  |  | 1.80 |  |  |  |
Number Of Shares |  |  |  | 1,500,000 |  |  |  |
Proceeds from Sale of Equity Method Investments (in Dollars) |  |  |  | 3,500,000 |  |  |  |
Proceeds From Equity Method Investments Per Share (in Dollars per share) |  |  |  | $ 2.35 |  |  |  |
Arkansas River Agreement [Member] |  |  |  |  |  |  |  |
Number Of Shares |  |  |  | 750,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 8 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 10 years |  |  |  |
NonEmployee Director [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 12,500 | 17,500 | 12,500 |  |  |  |  |
Unrecognized [Member] |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) |  |  |  | $ 13,200 |  |  |  |

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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant