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Note 4 - Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] |
|  |  |  |  |  | Fair Value Measurement at September 30, 2025 |
|  | Carrying Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability |  | $ | 243,000 |  |  |  | — |  |  |  | — |  |  | $ | 243,000 |
Totals liabilities measured and recorded at fair value |  | $ | 243,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 243,000 |
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] |
|  | September 30, 2025 |
Closing stock price: |  | $ | 0.17 |
Volatility: |  |  | 180.0 | %
Expected term (in years): |  |  | 1.70 |
Risk-free rate: |  |  | 3.6 | %
|  |  |  | %
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  | 2025 |  |  | 2024 |
|  | Number of |  |  | Weighted Average |  |  | Number of |  |  | Weighted Average |
|  | Warrants |  |  | Exercise Price |  |  | Warrants |  |  | Exercise Price |
Outstanding at January 1, |  |  | 39,633 |  |  | $ | 503.75 |  |  |  | 3,052 |  |  | $ | 4,054.81 |
Warrants issued |  |  | — |  |  |  | — |  |  |  | 64,124 |  |  |  | 118.37 |
Outstanding at March 31, |  |  | 39,633 |  |  | $ | 503.75 |  |  |  | 67,176 |  |  | $ | 297.21 |
Warrants exercised |  |  | — |  |  |  | — |  |  |  | 11,962 |  |  |  | 0.01 |
Outstanding at June 30, |  |  | 39,633 |  |  | $ | 503.75 |  |  |  | 55,214 |  |  | $ | 361.60 |
Warrants exercised |  |  | — |  |  |  | — |  |  |  | 15,580 |  |  |  | 0.01 |
Warrants cancelled or expired |  |  | 25 |  |  |  | 7,620.00 |  |  |  | — |  |  |  | — |
Outstanding at September 30, |  |  | 39,608 |  |  | $ | 499.26 |  |  |  | 39,634 |  |  | $ | 503.74 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Nine Months Ended September 30, 2024
Expected term (in years): |  | 5.0
Risk-free rate: |  | 4.52%
Volatility: |  | 87.49%
Dividend yield: |  | 0%
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | 2025 |  |  | 2024 |
|  | Number of |  |  | Weighted Average |  |  | Number of |  |  | Weighted Average |
|  | Options |  |  | Exercise Price |  |  | Options |  |  | Exercise Price |
Outstanding at January 1, |  |  | 5,706 |  |  | $ | 6,081.61 |  |  |  | 5,750 |  |  | $ | 6,054.32 |
Options expired or cancelled |  |  | 1 |  |  |  | 4,280.00 |  |  |  | 9 |  |  |  | 1,620.00 |
Outstanding at March 31, |  |  | 5,705 |  |  | $ | 6,081.93 |  |  |  | 5,741 |  |  | $ | 6,061.27 |
Options expired or cancelled |  |  | — |  |  |  | — |  |  |  | 23 |  |  |  | 2,734.78 |
Outstanding at June 30, |  |  | 5,705 |  |  | $ | 6,081.93 |  |  |  | 5,718 |  |  | $ | 6,074.65 |
Options expired or cancelled |  |  | — |  |  |  | — |  |  |  | 9 |  |  |  | 2,766.67 |
Outstanding at September 30, |  |  | 5,705 |  |  | $ | 6,081.93 |  |  |  | 5,709 |  |  | $ | 6,079.87 |
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | 2025 |  |  | 2024 |
|  | Number of |  |  | Weighted Average |  |  | Number of |  |  | Weighted Average |
|  | Units |  |  | Grant Date Fair Value |  |  | Units |  |  | Grant Date Fair Value |
Outstanding at January 1, |  |  | 2,124 |  |  | $ | 362.71 |  |  |  | 1,049 |  |  | $ | 2,977.29 |
Restricted stock units granted |  |  | 1,600 |  |  |  | 22.05 |  |  |  | — |  |  |  | — |
Restricted stock units vested |  |  | 200 |  |  |  | 2,813.10 |  |  |  | 245 |  |  |  | 3,300.00 |
Restricted stock units forfeited or cancelled |  |  | 37 |  |  |  | 2,861.35 |  |  |  | 127 |  |  |  | 3,300.00 |
Outstanding at March 31, |  |  | 3,487 |  |  | $ | 39.34 |  |  |  | 677 |  |  | $ | 2,799.97 |
Restricted stock units vested |  |  | 1,590 |  |  |  | 54.00 |  |  |  | 391 |  |  |  | 2,434.22 |
Restricted stock units forfeited or cancelled |  |  | 297 |  |  |  | 54.00 |  |  |  | 81 |  |  |  | 3,300.00 |
Outstanding at June 30, |  |  | 1,600 |  |  | $ | 22.05 |  |  |  | 205 |  |  | $ | 3,300.00 |
Restricted stock units forfeited or cancelled |  |  | 240 |  |  |  | 22.05 |  |  |  | 1 |  |  |  | 3,300.00 |
Outstanding at September 30, |  |  | 1,360 |  |  | $ | 22.05 |  |  |  | 204 |  |  | $ | 3,300.00 |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/820/tableOfContent + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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