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Note 8 - Common Stock (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 02, 2017 USD ($) shares | Jan. 31, 2013 shares | May 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Common Stock, Capital Shares Reserved for Future Issuance |  | 400,000 |  |  |  |
Percentage Of Projects Annual Capacity |  | 51.00% |  |  |  |
Number of Milestones for Common Stock Issuance |  | 4 |  |  |  |
Shares Payable Term From Date Earned |  | 3 years |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  |  | $ 520,000 | $ 171,000 | $ 473,000 | $ 2,304,000
Stock Issued During Period, Value, New Issues | $ |  |  |  |  | 15,503,000 | 3,734,000
Interest Expense [Member] | Issuance of Shares and Cancellation of Warrants [Member] |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total | $ |  |  |  |  |  | 3,100,000
Prior Lenders [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 264,096 |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ | $ 3,300,000 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called, Cancelled During Period | 357,500 |  |  |  |  |
Water Project with Brownstein [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ |  |  |  |  | $ 1,900,000 | $ 1,800,000
Shares Earned Upon Execution Of The Revised Agreement [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 100,000 |  |  |  |
Shares Earned Upon Receipt By The Company [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 100,000 |  |  |  |
Shares Earned Upon The Signing Of Binding Agreements [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 100,000 |  |  |  |
Shares Earned Upon The Commencement Of Construction [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 100,000 |  |  |  |

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