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Note 8 - Common Stock (Details Textual) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2013 shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Common Stock, Shares Authorized |  | 70,000,000 | 70,000,000
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.01 | $ 0.01
Common Stock, Shares, Issued, Total |  | 28,480,567 | 24,654,911
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 |  |
Common Stock, Shares, Outstanding, Ending Balance |  | 28,480,567 | 24,654,911
Water Project with Brownstein [Member] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ |  | $ 2.3 | $ 1.9
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 |  |

X
- Definition Number of milestones achievable for common stock issuance. + References No definition available. + Details
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- Definition Percentage of projects annual capacity. + References No definition available. + Details
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- Definition In the context of shares that are issued when a milestone is reached, this element represents the number of years from the date earned, in which shares will be payable. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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