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Note 13 - Capital Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 08, 2024 | Mar. 03, 2023 | Dec. 30, 2020 | Jun. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2023
Common Stock, Shares Authorized (in shares) |  |  |  |  |  | 300,000,000 | 300,000,000 |  | 300,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 1,000,000 | 1,000,000 |  | 1,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Common Stock, Shares, Issued (in shares) |  |  |  |  |  | 128,433,721 | 128,422,851 |  | 128,422,851
Preferred Stock, Shares Issued (in shares) |  |  |  |  |  | 0 | 0 |  | 0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 105,432,083 | 105,432,083 |  | 105,432,083
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  | 128,433,721 | 128,422,851 |  | 128,422,851
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  | 0 | 0 |  | 0
ATM Facility [Member] |  |  |  |  |  |  |  |  |
Aggregate Offering Price |  |  |  |  | $ 50,000 |  |  |  |
Fixed Commission Rate Percentage |  |  |  |  |  | 3.00% |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 0 | 2,895,090 |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  | $ 4,500 |
Payments for Commissions |  |  |  |  |  |  |  | $ 100 |
ATM Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Aggregate Offering Price | $ 12,300 |  |  |  |  |  |  |  |
Canaccord [Member] | Underwriting Agreement [Member] |  |  |  |  |  |  |  |  |
Unit Issued During Period, Units, New Issues (in shares) |  |  |  | 50,000,000 |  |  |  |  |
Unit Issued, Price Per Unit (in dollars per share) |  |  |  | $ 0.8 |  |  |  |  |
Each Unit, Number of Common Stock (in shares) |  |  |  | 1 |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 40,000 |  |  |  |  |
Payment for Underwriting Fees and Commissions |  |  |  | 2,400 |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  | 200 |  |  |  |  |
Gain (Loss) on Issuance of Equity |  |  |  | $ (14,800) |  |  |  |  |
Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 332,668 |  |  |  |  |  |  |
Purchase Agreement, Commencing Period (Month) |  | 36 months |  |  |  |  |  |  |
Purchase Agreement, Regular Purchase (in shares) |  | 75,000 |  |  |  |  |  |  |
Purchase Agreement, Regular Purchase, Shares, Closing Price One (in shares) |  | 100,000 |  |  |  |  |  |  |
Purchase Agreement, Closing Price One (in dollars per share) |  | $ 1 |  |  |  |  |  |  |
Purchase Agreement, Regular Purchase, Shares, Closing Price Two (in shares) |  | 150,000 |  |  |  |  |  |  |
Purchase Agreement, Closing Price Two (in dollars per share) |  | $ 2 |  |  |  |  |  |  |
Purchase Agreement, Regular Purchase, Shares, Closing Price Three (in shares) |  | 200,000 |  |  |  |  |  |  |
Purchase Agreement, Closing Price Three (in dollars per share) |  | $ 4 |  |  |  |  |  |  |
Purchase Agreement, Accelerated Purchase, Maximum Percentage of Regular Purchase |  | 300.00% |  |  |  |  |  |  |
Purchase Agreement, Accelerated Purchase, Maximum Percentage Of Prior Day Volume |  | 30.00% |  |  |  |  |  |  |
Purchase Agreement, Additional Accelerated Purchase, Maximum Percentage of Regular Purchase |  | 300.00% |  |  |  |  |  |  |
Purchase Agreement, Additional Accelerated Purchase, Maximum Percentage of Prior Day Volume |  | 30.00% |  |  |  |  |  |  |
Purchase Agreement, Price Discount of Additional Purchases |  | 97.00% |  |  |  |  |  |  |
Purchase Agreement, Additional Commitment Shares (in shares) |  | 166,334 |  |  |  |  |  |  |
Purchase Agreement, Shares Sell Limitation (in shares) |  | 15,310,115 |  |  |  |  |  |  |
Purchase Agreement, Shares Sell Limitation, Percentage Of Outstanding Shares |  | 19.99% |  |  |  |  |  |  |
Percentage of Common Stock Beneficial Ownership |  | 4.99% |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 0 | $ 0 |  | $ 0
Lincoln Park Capital Fund, LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Purchase Agreement, Amount Of Shares Commit To Purchase |  | $ 25,000 |  |  |  |  |  |  |
Percentage of Common Stock Beneficial Ownership |  | 9.99% |  |  |  |  |  |  |
Lincoln Park Capital Fund, LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Purchase Agreement, Minimum Average Price Per Share To Avoid Sell Limitation (in dollars per share) |  | $ 1.2404 |  |  |  |  |  |  |
Lincoln Park [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 0 |  | 0 |
Warrants Originally Issued by Tottenham Acquisition I Limited [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 2,407,500 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 0.5 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 0.01 |  |  |  |  |  |
Class of Warrant or Right, Redemption, Threshold Stock Price Trigger (in dollars per share) |  |  | $ 16.5 |  |  |  |  |  |
Class of Warrant or Right, Redemption, Threshold Consecutive Trading Days (Day) |  |  | 20 days |  |  |  |  |  |
Class of Warrant or Right, Redemption, Threshold Trading Days (Day) |  |  | 30 days |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 0 |  |  | 0
Chardan Unit Purchase Option [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 24,583 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 0.5 |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 0 |  |  | 0
New Avenue Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  | 3,000,000 |  | 3,000,000
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 0 |  |  | 0
Tranche A Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 50,000,000 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 0 |  |  | 0
Tranche A Warrant [Member] | Canaccord [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 1.1 |  |  |  |  |
Each Unit, Number of Warrant (in shares) |  |  |  | 1 |  |  |  |  |
Tranche B Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 50,000,000 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 0 |  |  | 0
Tranche B Warrant [Member] | Canaccord [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 1.5 |  |  |  |  |
Each Unit, Number of Warrant (in shares) |  |  |  | 1 |  |  |  |  |

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