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Note 14 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 23, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Proceeds from Issuance of Common Stock |  | $ 32,459 | $ 14,767
Subsequent Event [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 6,857,140 |  |
Shares Issued, Price Per Share (in dollars per share) | $ 1.75 |  |
Proceeds from Issuance of Common Stock, Gross | $ 12,000 |  |
Proceeds from Issuance of Common Stock | $ 11,800 |  |
Subsequent Event [Member] | Keith Brackpool [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,142,857 |  |
Subsequent Event [Member] | Geoffrey Grant [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 285,714 |  |
Subsequent Event [Member] | Heerema International Group Services S.A. [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 2,857,142 |  |
Subsequent Event [Member] | Keith Brackpool, Geoffrey Grant, and Heerema International Group Services S.A. [Member] |  |  |
Common Stock Ownership, Percent | 35.40% |  |

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- Definition Number of new stock issued during the period. + 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 Reference 2: 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=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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