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Note 6 - Stockholders' Equity and Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 $ / shares shares | Feb. 05, 2025 shares | Jan. 01, 2025 shares | Jul. 03, 2024 USD ($) $ / shares shares | Mar. 28, 2024 USD ($) $ / shares shares | Jan. 31, 2025 shares | Dec. 31, 2024 $ / shares shares | Mar. 31, 2024 shares | Nov. 30, 2017 shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) | Dec. 31, 2017 shares | Sep. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2025 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares | $ 0.001 |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Equity Classified Subscription, Value | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 47,700 |  |  |
Right Offering Deemed Dividend | $ |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 47,700 |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  |  |  | 14,080 | 1,536 |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  | $ 5,617 | $ 2,982 | $ 16,487 | 6,793 |  |  |
Time-based Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 8,939,677 |  |  |  |  |  | 8,075,265 |  |  | 8,939,677 |  | 8,939,677 |  |  | 8,939,677 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,424,343 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Intrinsic Value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 20,900 |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  | $ 3,937 | 2,131 | $ 11,623 | 4,609 |  |  |
Performance-based Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 442,678 |  |  |  |  |  | 442,678 |  |  | 442,678 |  | 442,678 |  |  | 442,678 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  | $ 0 | 5 | $ 0 | 27 |  |  |
Market-based Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 2,721,389 |  |  |  |  |  | 2,461,389 |  |  | 2,721,389 |  | 2,721,389 |  |  | 2,721,389 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  |  | 260,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Intrinsic Value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  | $ 1,577 | $ 788 | $ 4,581 | $ 1,978 |  |  |
Performance-based and Market-based Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | 1,200,000 |  |  |  |  |  | 0 |  |  | 1,200,000 |  | 1,200,000 |  |  | 1,200,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Intrinsic Value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 18,900 |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |
The 2017 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | 2,000,000 |  | 1,200,000 |  |  |  | 1,375,000 |  |  |  |  |  |  |  |  |
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Number of Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 1,072,564 |  |  |  |  |  |  |  |  | 1,072,564 |  | 1,072,564 |  |  | 1,072,564 |
The 2017 Inducement Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 2,328,709 |  |  |  |  |  |  |  |  | 2,328,709 |  | 2,328,709 |  |  | 2,328,709 |
The 2017 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  |  | 450,000 |  |  |  |  |  |  |  |  |  |
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Number of Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000 |  |
Increase in Shares Available for Issuance, Threshold of Common Stock Outstanding, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 851,183 |  |  |  |  |  |  |  |  | 851,183 |  | 851,183 |  |  | 851,183 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  |  |  |  |  |  |  |  |  |  | 44,596 |  |  |  |
Share-Based Payment Arrangement, Tranche One [Member] | Time-based Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Share-Based Payment Arrangement, Tranche One [Member] | The 2017 Inducement Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Maximum [Member] | The 2017 Inducement Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Warrants Issued in 2024 Rights Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 0.5 | 0.5 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 205,953 |  |  | 5,999,999 |  |  |  |  |  | 205,953 |  | 205,953 |  |  | 205,953 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrans or Right, Exercise Price, Percentage of Subscription Price for Units |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  |  |  |  |  |  |  |  |  |  | $ 14,100 |  |  | $ 63,500 |
Warrants Issued in 2024 Rights Offering [Member] | Vesting of First Half [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrants or Rights, Redemption Price Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Percentage Required for Redemption | 150.00% | 150.00% |  | 150.00% |  |  |  |  |  | 150.00% |  | 150.00% |  |  | 150.00% |
Class of Warrant or Right, Vesting, Stock Price Trigger (in dollars per share) | $ / shares |  |  |  | $ 16.5 |  |  |  |  |  |  |  |  |  |  |  | $ 18.85
Class of Warrant or Right, Expired/Redeemed During Period (in shares) |  | 18,221 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 0 | 0 |  |  |  |  |  |  |  | 0 |  | 0 |  |  | 0 |
Warrants Issued in 2024 Rights Offering [Member] | Vesting of Second Half [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrants or Rights, Redemption Price Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Percentage Required for Redemption | 200.00% |  |  | 200.00% |  |  |  |  |  | 200.00% |  | 200.00% |  |  | 200.00% |
Class of Warrant or Right, Vesting, Stock Price Trigger (in dollars per share) | $ / shares |  |  |  | $ 22 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 411,907 |  |  |  |  |  |  |  |  | 411,907 |  | 411,907 |  |  | 411,907 |
Warrants Issued in 2024 Rights Offering [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
The 2024 Right Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Equity Offering, Units, Maximum Amount Authorized (in shares) |  |  |  | 6,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Equity Offering Units, Offering Value | $ |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  | $ 10 | $ 10 |  |  |  |  |  |  |  |  |  |  |
Subscription Right, Number of Units |  |  |  |  | 0.10864186 |  |  |  |  |  |  |  |  |  |  |
Number of Shares Per Unit Issued (in shares) |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |
Number of Warrants in Each Unit (in shares) |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  |  |  | $ 11.55 |  |  |  |  |  |  |  |  |  |  |
Equity Classified Subscription, Value | $ |  |  |  |  | $ 47,700 |  |  |  |  |  |  |  |  |  |  |
Right Offering Deemed Dividend | $ |  |  |  |  | $ 47,700 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 5,999,998 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  |
The 2024 Right Offering [Member] | Majority Stockholder and Co-chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of Offering Purchased |  |  |  | 88.00% |  |  |  |  |  |  |  |  |  |  |  |

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