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Note 1 - Organization and Operations (Details Textual) | Oct. 12, 2020 $ / shares shares | Sep. 15, 2020 | Jan. 03, 2022 | Dec. 31, 2021 $ / shares | Dec. 31, 2020 $ / shares
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Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.01 | $ 0.01
Subsequent Event [Member] | Momentum Fuel Technologies [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |
Common Class A [Member] |  |  |  |  |
Additional Share Issued for Every Two Shares of Common Stock (in shares) | shares | 1 |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |  |
Common Class B [Member] |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |  |
Stock Split From [Member] |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 3 |  |  |
Stock Split To [Member] |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 2 |  |  |

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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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