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Note 8 - Common Stock and Preferred Stock (Details Textual) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 05, 2020 shares | Jan. 31, 2013 shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Common Stock, Shares Authorized (in shares) |  |  | 70,000,000 | 70,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 0.01 | $ 0.01
Common Stock, Shares, Issued, Total (in shares) |  |  | 36,902,361 | 28,480,567
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 400,000 |  |
Percentage Of Projects Annual Capacity |  | 51.00% |  |
Number of Milestones for Common Stock Issuance |  | 2 |  |
Shares Payable Term From Date Earned (Year) |  | 3 years |  |
Water Project with Brownstein [Member] |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ |  |  | $ 1.5 | $ 2.3
Shares Earned Upon The Signing Of Binding Agreements [Member] |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 100,000 |  |
Shares Earned Upon The Commencement Of Construction [Member] |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 100,000 |  |
Conversion of Series 1 Preferred Stock in to Common Stock [Member] |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  | 2,469 |
Conversion of Stock, Shares Issued (in shares) |  |  | 1,000,068 |
Preferred Class A [Member] |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | 405.05 |  |  |
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member] |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 10,000 |  |  |

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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=120391452&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=120391452&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=120391452&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=120391452&loc=d3e13212-122682 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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