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Note 15 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 24, 2025 | Jul. 18, 2024 | Jun. 20, 2024 | Jun. 17, 2024 | Dec. 20, 2023 | Jul. 26, 2023 | Dec. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2026 | Nov. 30, 2025 | Dec. 31, 2019
Common Stock, Shares Authorized (in shares) |  |  |  |  |  |  | 100,000,000 |  |  |  | 100,000,000 |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  |  | 48,350,272 |  |  |  | 48,708,280 |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  | $ 120.0 |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  |  | 48,350,272 |  |  |  | 48,708,280 |  |
Conversion of Prefunded Warrants Into Ordinary Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) | 3,206,271 |  |  |  | 1,599,733 |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) | 3,206,271 |  |  |  | 1,599,840 |  |  |  |  |  |  |  |
Pre-funded Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  | 5,278,776 |  |  |  |  | 472,665 |  |
Class of Warrants or Rights, Issuance Price Per Share (in dollars per share) |  |  |  |  |  | $ 9.539 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |
Prefunded Warrants Associated With Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  | 1,142,857 |  |  |  |  |  |  | 1,142,857 |  |
Class of Warrants or Rights, Issuance Price Per Share (in dollars per share) |  |  |  | $ 17.499 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |
ATM Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Authorize Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 100.0
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 416,248 |  | 3,400,468 |  |  |
Net Proceeds From Issuance of Common Stock, After Deducting Sales Commissions |  |  |  |  |  |  |  | $ 8.0 |  | $ 54.7 |  |  |
ATM Sales Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, New Issues, Sales Commission Percentage |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |
ATM Prospectus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Authorize Amount |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 1,370,962 |  |  |  |  |  |
Net Proceeds From Issuance of Common Stock, After Deducting Sales Commissions |  |  |  |  |  |  | $ 31.8 |  |  |  |  |  |
Sale of Stock, Remaining Amount Authorized |  |  |  |  |  |  |  |  |  |  | $ 42.4 |  |
ATM Prospectus [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, New Issues, Sales Commission Percentage |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 7,300,380 |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 9.54 |  |  |  |  |  |  |
Placement Agents and Financial Advisors Fees |  |  |  |  |  | $ 3.6 |  |  |  |  |  |  |
Private Placement [Member] | Monograph Capital Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 1,572,327 |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  | $ 15.0 |  |  |  |  |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  | $ 17.5 |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 107.5 |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 7.3 |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 921,428 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 16.1 |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 1.0 |  |  |  |  |  |  |  |  |  |  |
Equity Sale, Shares Issuable (in shares) |  |  | 921,428 |  |  |  |  |  |  |  |  |  |

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