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Note 9 - Common Stock (Details Textual) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 09, 2013 USD ($) shares | Nov. 30, 2014 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jul. 31, 2013 USD ($)
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 |  |  |  |  |
Compensation Payment per Month [Member] |  |  |  |  |  |
Compensation | $ | $ 25,000 |  |  |  |  |
Percentage Of Present Value Of Project Paid As Incentive Compensation | 1.00% |  |  |  |  |
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 |  |  |  |  |
Share-based Compensation | $ | $ 373,000 |  | $ 1,116,000 | $ 1,077,000 | $ 516,000 |
Shelf Registration Value | $ |  |  |  |  |  | $ 40,000,000
Proceeds from Issuance of Common Stock | $ |  | $ 14,600,000 |  | $ 14,523,000 |  |
Stock Issued During Period, Shares, New Issues |  | 1,435,713 |  |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 10.1751 |  |  |  |

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