Note 1 - Summary of Significant Accounting Policies (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| Notes Tables |
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| Schedule of Cash and Cash Equivalents [Table Text Block] |
| | September 30, | | | December 31, | |
| | 2026 | | | 2025 | |
Cash and cash equivalents | | | | | | | | |
Cash | | $ | 7,236,715 | | | $ | 1,637,496 | |
Money market funds | | | 40,454,395 | | | | 7,472,940 | |
Time deposits | | | 14,409,179 | | | | 10,391,912 | |
Total cash and cash equivalents | | $ | 62,100,289 | | | $ | 19,502,348 | |
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| Unrealized Gain (Loss) on Investments [Table Text Block] |
| | As of December 31, 2025 | |
| | | | | | Gross Unrealized | | | Gross Unrealized | | | | | |
| | Amortized Cost | | | Gains | | | (losses) | | | Fair Value | |
Marketable securities | | | | | | | | | | | | | | | | |
U.S. Treasury bills | | $ | 21,277,609 | | | $ | 98,006 | | | $ | - | | | $ | 21,375,615 | |
Total marketable securities | | $ | 21,277,609 | | | $ | 98,006 | | | $ | - | | | $ | 21,375,615 | |
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| Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
| | Nine Months Ended September 30, | |
| | 2026 | | | 2025 | |
| | | | | | | | |
Balance at January 1 | | $ | 336,539 | | | $ | 486,772 | |
Decrease from accounts receivable collected | | | (85,752 | ) | | | (193,527 | ) |
Increase for accounts receivable not yet collected | | | 176,939 | | | | 9,085 | |
Balance at September 30 | | $ | 427,726 | | | $ | 302,330 | |
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| Schedule of Inventory, Current [Table Text Block] |
| | September 30, | | | December 31, | |
| | 2026 | | | 2025 | |
| | | | | | | | |
Inventories - Current Portion | | | | | | | | |
Raw materials | | $ | 458,274 | | | $ | 292,566 | |
Work in process | | | 290,956 | | | | 103,215 | |
Finished goods | | | 1,165,210 | | | | 700,284 | |
Total Inventories - Current Portion | | | 1,914,440 | | | | 1,096,065 | |
Inventories - Long-term | | | | | | | | |
Raw materials | | | 293,764 | | | | 415,383 | |
Finished goods | | | 437,662 | | | | - | |
Total Inventories - Long-term | | | 731,426 | | | | 415,383 | |
Total Inventories | | $ | 2,645,866 | | | $ | 1,511,448 | |
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| Property, Plant, and Equipment, Useful Life Estimate [Table Text Block] |
Office furniture and equipment (years) | | 5 | |
Lab and production equipment (years) | | 5 | |
Computer equipment (years) | | 3 - 5 | |
MR scanner (years) | | 7 | |
Leasehold improvements | | Lesser of useful life or remaining lease term | |
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| Schedule of Other Assets [Table Text Block] |
| | September 30, | | | December 31, | |
| | 2026 | | | 2025 | |
| | | | | | | | |
Security deposit | | $ | 41,097 | | | $ | 60,488 | |
Equity investment | | | 69,560 | | | | 69,560 | |
Derivative asset | | | - | | | | 56,243 | |
Convertible note receivable | | | 352,000 | | | | - | |
| | $ | 462,657 | | | $ | 186,291 | |
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| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| | Three Months Ended September 30, | | | Nine Months Ended September 30, | |
| | 2026 | | | 2025 | | | 2026 | | | 2025 | |
Net loss for basic calculation | | $ | (2,909,628 | ) | | $ | (3,494,087 | ) | | $ | (28,048,400 | ) | | $ | (16,635,440 | ) |
Adjustments for change in fair value of: | | | | | | | | | | | | | | | | |
Convertible notes (related party) | | | (4,079,700 | ) | | | (1,518,100 | ) | | | - | | | | - | |
Warrant liabilities | | | (334,293 | ) | | | (142,304 | ) | | | - | | | | - | |
Option liabilities | | | (21,666 | ) | | | (142,288 | ) | | | - | | | | - | |
Net loss for diluted calculation | | $ | (7,345,287 | ) | | $ | (5,296,779 | ) | | $ | (28,048,400 | ) | | $ | (16,635,440 | ) |
| | | | | | | | | | | | | | | | |
Weighted-average shares outstanding — basic | | | 358,022,717 | | | | 320,542,276 | | | | 339,876,210 | | | | 304,651,497 | |
Effect of dilutive securities: | | | | | | | | | | | | | | | | |
Convertible notes (related party) | | | 26,020,693 | | | | 23,570,817 | | | | - | | | | - | |
Warrants | | | 1,024,576 | | | | 637,879 | | | | - | | | | - | |
Stock options | | | 369,914 | | | | 2,891,240 | | | | - | | | | - | |
Weighted-average shares outstanding — diluted | | | 385,437,900 | | | | 347,642,212 | | | | 339,876,210 | | | | 304,651,497 | |
Net loss per share: | | | | | | | | | | | | | | | | |
Basic | | $ | (0.01 | ) | | $ | (0.01 | ) | | $ | (0.08 | ) | | $ | (0.05 | ) |
Diluted | | $ | (0.02 | ) | | $ | (0.02 | ) | | $ | (0.08 | ) | | $ | (0.05 | ) |
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| Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
| | Three Months Ended September 30, | | | Nine Months Ended September 30, | |
| | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| | | | | | | | | | | | | | | | |
Exercise of stock options | | | 36,171,577 | | | | 33,790,121 | | | | 41,223,116 | | | | 38,986,186 | |
Conversion of convertible notes (related party) | | | - | | | | - | | | | 26,675,169 | | | | 24,165,796 | |
Exercise of warrants | | | 3,037,465 | | | | 3,115,590 | | | | 5,138,033 | | | | 5,216,158 | |
Total | | | 39,209,042 | | | | 36,905,711 | | | | 73,036,318 | | | | 68,368,140 | |
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| Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
| | Nine Months Ended September 30, | |
| | 2026 | | | 2025 | |
| | | | | | | | |
Balance at January 1 | | $ | 1,119,788 | | | $ | 1,158,052 | |
Decrease from revenue recognized for completion of performance obligations that were included in contract liabilities at the beginning of the period included in: | | | | | | | | |
Service revenue | | | (24,045 | ) | | | (39,689 | ) |
Increase for revenue deferred as the performance obligation has not been satisfied related to: | | | | | | | | |
Product revenue | | | 2,589 | | | | - | |
Service revenue | | | 36,888 | | | | 17,253 | |
Balance at September 30 | | $ | 1,135,220 | | | $ | 1,135,616 | |
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| Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
| | As of September 30, 2026 | |
| | Level 1 | | | Level 2 | | | Level 3 | | | Total | |
Current Liabilities | | | | | | | | | | | | | | | | |
Current portion of convertible notes (related party) | | $ | - | | | $ | - | | | $ | 29,107,200 | | | $ | 29,107,200 | |
Total Current Liabilities | | $ | - | | | $ | - | | | $ | 29,107,200 | | | $ | 29,107,200 | |
Long-term Liabilities | | | | | | | | | | | | | | | | |
Warrant liabilities | | $ | - | | | $ | - | | | $ | 1,922,509 | | | $ | 1,922,509 | |
Total Long-term Liabilities | | $ | - | | | $ | - | | | $ | 1,922,509 | | | $ | 1,922,509 | |
| | As of December 31, 2025 | |
| | Level 1 | | | Level 2 | | | Level 3 | | | Total | |
Long-term Assets | | | | | | | | | | | | | | | | |
Derivative asset | | $ | - | | | $ | - | | | $ | 56,243 | | | $ | 56,243 | |
Total Long-term Assets | | $ | - | | | $ | - | | | $ | 56,243 | | | $ | 56,243 | |
Current Liabilities | | | | | | | | | | | | | | | | |
Current portion of convertible notes (related party) | | $ | - | | | $ | - | | | $ | 11,745,700 | | | $ | 11,745,700 | |
Option liabilities | | $ | - | | | $ | - | | | $ | 3,157,717 | | | $ | 3,157,717 | |
Total Current Liabilities | | $ | - | | | $ | - | | | $ | 14,903,417 | | | $ | 14,903,417 | |
Long-term Liabilities | | | | | | | | | | | | | | | | |
Convertible notes, net of current portion (related party) | | $ | - | | | $ | - | | | $ | 13,268,500 | | | $ | 13,268,500 | |
Warrant liabilities | | $ | - | | | $ | - | | | $ | 1,828,677 | | | $ | 1,828,677 | |
Total Long-term Liabilities | | $ | - | | | $ | - | | | $ | 15,097,177 | | | $ | 15,097,177 | |
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