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Note 5 - Capital Stock (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 33 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 06, 2025 | Jun. 04, 2025 | Mar. 30, 2023 | Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Sep. 30, 2025 | Jun. 05, 2025 | Apr. 17, 2025 | Aug. 23, 2024 | Oct. 06, 2023 | Mar. 31, 2023
Common Stock, Shares Authorized (in shares) |  |  |  |  | 150,000,000 |  |  | 150,000,000 | 150,000,000 |  | 150,000,000 |  | 150,000,000 |  | 150,000,000 | 150,000,000 |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  | 3,207,399 |  |  | 3,207,399 | 3,207,399 |  | 3,207,399 |  | 1,144,926 |  | 1,144,926 | 3,207,399 |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  | 3,207,210 |  |  | 3,207,210 | 3,207,210 |  | 3,207,210 |  | 1,144,737 |  | 1,144,737 | 3,207,210 |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  |  |  |  |  |  | $ 29,000 | $ 76,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001 |  |  |  |  |
Warrant Adjustment, Deemed Dividend |  |  |  |  | $ 0 |  | $ 8,974,000 |  |  |  | $ 0 | $ 8,974,000 | $ 8,974,000 |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.0001 |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  | 0.0001 | $ 0.0001 |  |  |  |  |
Warrants Post Reverse Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | [1] |  |  |  | 127,531 |  |  | 127,531 | 127,531 |  | 127,531 |  |  |  |  | 127,531 |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  | 575 |  |  |  |  |  | 575 | 1,648 |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  |  |  |  |  |  | 970 |  | 3,033 |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  | $ 89,000,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  | 575 |  | 1,648 |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  |  | $ 68.4 | $ 3.77 |  | $ 11.17 | $ 3.77 | $ 3.77 |  | $ 3.77 | $ 11.17 | $ 11.17 | $ 13.6 | $ 11.17 | $ 3.77 | $ 3.77 |  |  |  |
Preferred Stock, Convertible, Floor Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.17 |
Private Placement [Member] | Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 6,550 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2025 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Fees |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Series F Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  | 212,454 |  |  |  |  |  | 257,617 | 288,968 | 288,947 | 352,624 | 641,571 | 899,188 |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  | 780 |  |  |  |  |  | 970 | 3,033 |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  | $ 20,000 |  |  |  |  |  | $ 39,000 | $ 194,000 |  |  |  |  |  |  |  |  |
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  | 116,861 |  | 208,933 |  |  |  | 521,725 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  | 116,861 |  | 208,933 |  |  |  | 521,725 |  |  |  |  |  |  |  |  |  |
Proceeds From Warrant Exercises, Net |  |  |  |  |  |  |  |  |  |  | $ 1,639,000 | $ 672,000 |  |  |  |  |  |  |  |  |
Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  | 1,283,131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  | 1,283,131 |  |  |  |  |  | 1,283,131 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 1,989,392 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 3.77 |  |  | $ 3.77 |  |  | $ 3.77 | $ 3.77 |  | $ 3.77 |  |  |  |  | $ 3.77 |  |  |  |  |
Warrants and Rights Outstanding, Term (Month) |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 706,261 |  |  | 706,261 | 706,261 |  | 706,261 |  |  |  |  | 706,261 |  |  |  |  |
Proceeds From Warrant Exercises, Net |  | $ 6,888,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Warrants |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Expenses |  | $ 237,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per Warrant or Right (in dollars per share) |  | $ 3.7699 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Maximum Beneficial Ownership |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Maximum Beneficial Ownership, Election of Holder |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of Stock Ownership, Warrant Transaction Threshold for Shares |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  | 575 |  |  |  |  |  | 575 | 1,648 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 32,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 975 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Month) |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 30,527 |  |  | 30,527 | 30,527 |  | 30,527 |  |  |  |  | 30,527 |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 561,000 |  |  |  |  |  | $ 561,000 | $ 1,607,000 |  |  |  |  |  |  |  |  |
Proceeds From Warrant Exercises, Net |  |  |  |  | 516,000 |  |  |  |  |  | 516,000 | 1,478,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee |  |  |  |  | $ 45,000 |  |  |  |  |  | 45,000 | $ 129,000 |  |  |  |  |  |  |  |  |
Investor Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 95,764 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 7,663 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,427
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 68.4
Class of Warrant or Right, Beneficial Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.99%
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 153,470 |  |
Warrant Adjustment, Deemed Dividend |  |  |  |  |  |  |  |  |  |  | $ 539,000 |  |  |  |  |  |  |  |  |  |
Placement Agent Warrants [Member] | Warrants Post Reverse Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | [1] |  |  |  | $ 68.4 |  |  | $ 68.4 | $ 68.4 |  | $ 68.4 |  |  |  |  | $ 68.4 |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | [1] |  |  |  | 7,663 |  |  | 7,663 | 7,663 |  | 7,663 |  |  |  |  | 7,663 |  |  |  |  |
Common Warrants Issued from Preferred Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  | 116,861 |  | 208,933 |  |  |  | 521,725 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  | 116,861 |  | 208,933 |  |  |  | 521,725 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued (in shares) |  |  |  |  | 152,519 |  |  |  |  |  | 152,519 |  | 24,104 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 3.41 |  |  | $ 3.41 | $ 3.41 |  | $ 3.41 |  |  |  |  | $ 3.41 |  |  |  |  |
Warrants and Rights Outstanding, Term (Month) |  |  |  |  | 5 years |  |  | 5 years | 5 years |  | 5 years |  | 5 years |  | 5 years | 5 years |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share) |  |  |  |  | $ 3.41 |  |  |  |  |  | $ 3.41 |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 399,000 |  | $ 713,000 |  |  |  | $ 1,781,000 |  |  |  |  |  |  |  |  |  |
Proceeds From Warrant Exercises, Net |  |  |  |  | 367,000 |  | 671,000 |  |  |  | 1,639,000 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee |  |  |  |  | $ 32,000 |  | $ 57,000 |  |  |  | $ 142,000 |  |  |  |  |  |  |  |  |  |
Common Warrants Issued from Preferred Warrants [Member] | Warrants Post Reverse Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 68.4 |  | $ 68.4 |  |  |  |  |  |
Common Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  |  |  |  |  |  |  | 1,804,856 |  | 282,314 |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued (in shares) |  |  |  |  |  |  |  |  |  |  | 2,341,381 |  | 24,104 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 3.56 |  |  | $ 3.56 | $ 3.56 |  | $ 3.56 |  | $ 3.41 | $ 69.03 | $ 3.41 | $ 3.56 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 3.67 |  | $ 3.41 |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 2,808,728 |  |  | 2,808,728 | 2,808,728 |  | 2,808,728 |  | 2,272,203 | 103,453 | 2,272,203 | 2,808,728 |  |  | 2,401,047 |  |
The 2025 Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 99,470 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Cash Fee, Percentage of Proceeds |  |  |  |  | 5.00% |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 4.7125 |  | $ 4.71 |  |  | $ 4.71 | $ 4.71 |  | $ 4.71 |  |  |  |  | $ 4.71 |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 99,470 |  |  | 99,470 | 99,470 |  | 99,470 |  |  |  |  | 99,470 |  |  |  |  |
Class of Warrant or Right, Cash Fee |  |  |  |  | $ 375,000 |  |  |  |  |  | $ 375,000 |  |  |  |  |  |  |  |  |  |
Legal Fees |  |  |  |  | $ 50,000 |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |
Advisor Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 3.77 |  |  | $ 3.77 | $ 3.77 |  | $ 3.77 |  |  |  |  | $ 3.77 | $ 3.77 |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 100,000 |  |  | 100,000 | 100,000 |  | 100,000 |  |  |  |  | 100,000 |  |  |  |  |
Class of Warrant or Right, Vesting Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.33% |  |  |  |
Class of Warrant or Right, Vesting During Period (in shares) |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program, Authorized, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
Share Repurchase Program, Remaining Authorized, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
[1] | Adjusted by the Reverse Split.

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- Definition The number of warrants or rights that have vested during the period. + References No definition available. + Details
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- Definition The percent of warrants or right that vest equally. + References No definition available. + Details
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