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Note 12 - Commitments And Contingencies (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2009 | Jun. 04, 2009
Operating Leases, Rent Expense | $ 343,000 | $ 338,000 | $ 371,000 |  |
Increase (Decrease) in Accounts Payable | 128,000 | 304,000 | (141,000) |  |
Interim Payments To Be Made Upon Achievement of Milestones | 1,500,000 |  |  |  |
Accrued Professional Fees |  |  |  | 500,000 | 500,000
Water Project [Member] |  |  |  |  |
Deferred Revenue | 750,000 |  |  |  |
Net Present Value of Water [Member] |  |  |  |  |
Potential Obligation Percentage of Water Project | 1.00% |  |  |  |
Annual Capacity of Water Project [Member] |  |  |  |  |
Potential Obligation Percentage of Water Project | 51.00% |  |  |  |
In Exchange for Services and Exclusivity Agreement [Member] |  |  |  |  |
Increase (Decrease) in Accounts Payable | $ 923,000 |  |  |  |

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