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Note 15 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2025
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | During the Years |
|  | Ended December 31, |
|  | 2025 |  |  | 2024 |
Current |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |
State |  |  | 11,570 |  |  |  | 10,056 |
Current subtotal |  |  | 11,570 |  |  |  | 10,056 |
Deferred |  |  |  |  |  |  |  |
Federal |  |  | (220,758 | ) |  |  | (500,927 | )
State |  |  | (111,888 | ) |  |  | (59,032 | )
Deferred subtotal, gross |  |  | (332,646 | ) |  |  | (559,959 | )
Valuation allowance |  |  | 332,646 |  |  |  | 559,959 |
Deferred subtotal, net |  |  | — |  |  |  | — |
Income tax expense |  | $ | 11,570 |  |  | $ | 10,056 |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | During the Years |
|  | Ended December 31, |
|  | 2025 |  |  | 2024 |
Domestic |  | $ | (1,028,457 | ) |  | $ | (2,146,573 | )
Foreign |  |  | — |  |  |  | — |
Loss before income taxes |  | $ | (1,028,457 | ) |  | $ | (2,146,573 | )
Schedule of Cash Paid for Income Taxes [Table Text Block] |
|  | During the Years |
|  | Ended December 31, |
|  | 2025 |  |  | 2024 |
Federal |  | $ | — |  |  | $ | — |
State and Local — California |  |  | 800 |  |  |  | 800 |
State and Local — Michigan |  |  | 791 |  |  |  | — |
State and Local — Minnesota |  |  | — |  |  |  | 1,000 |
State and Local — New York |  |  | 4,000 |  |  |  | 2,403 |
State and Local — Pennsylvania |  |  | 1,300 |  |  |  | — |
State and Local — Texas |  |  | 3,687 |  |  |  | 3,010 |
State and Local — Other |  |  | 113 |  |  |  | 80 |
State and Local |  |  | 10,691 |  |  |  | 7,293 |
International — Other |  |  | — |  |  |  | — |
International |  |  | — |  |  |  | — |
Total income taxes paid |  | $ | 10,691 |  |  | $ | 7,293 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | During the Years Ended December 31, |
|  | 2025 |  |  | 2024 |
|  |  | Amount |  |  |  | Percent |  |  |  | Amount |  |  |  | Percent |
Computed tax at Federal Statutory Rate (21%) |  | $ | (215,976 | ) |  |  | (21.00 | )% |  | $ | (450,780 | ) |  |  | (21.00 | )%
State and local income taxes, net of federal benefit(1) |  |  | (79,693 | ) |  |  | (7.75 | )% |  |  | (36,681 | ) |  |  | (1.71 | )%
Foreign tax effects |  |  | — |  |  |  | 0.00 | % |  |  | — |  |  |  | 0.00 | %
Effect of changes in tax laws/rates |  |  | — |  |  |  | 0.00 | % |  |  | — |  |  |  | 0.00 | %
Effect of cross-border tax laws |  |  | — |  |  |  | 0.00 | % |  |  | — |  |  |  | 0.00 | %
Research and experimental tax credits |  |  | (58,901 | ) |  |  | (5.73 | )% |  |  | (116,091 | ) |  |  | (5.41 | )%
Changes in valuation allowance |  |  | 332,646 |  |  |  | 32.34 | % |  |  | 559,959 |  |  |  | 26.09 | %
Nontaxable/nondeductible items |  |  | 5,280 |  |  |  | 0.51 | % |  |  | 4,619 |  |  |  | 0.22 | %
Share-based compensation |  |  | 28,214 |  |  |  | 2.75 | % |  |  | 49,030 |  |  |  | 2.28 | %
Changes in unrecognized tax benefits |  |  | — |  |  |  | 0.00 | % |  |  | — |  |  |  | 0.00 | %
Income tax expense |  | $ | 11,570 |  |  |  | 1.12 | % |  | $ | 10,056 |  |  |  | 0.47 | %
Schedule of State and Local Income Taxes [Table Text Block] |
|  | During the Years Ended December 31, |
|  | 2025 |  |  | 2024 |
|  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |
California |  | $ | (16,720 | ) |  |  | 20.98 | % |  | $ | (17,422 | ) |  |  | 47.50 | %
Maine |  |  | — |  |  |  | 0.00 | % |  |  | (6,456 | ) |  |  | 17.60 | %
Michigan |  |  | (7,070 | ) |  |  | 8.87 | % |  |  | — |  |  |  | 0.00 | %
Minnesota |  |  | (15,018 | ) |  |  | 18.85 | % |  |  | (7,158 | ) |  |  | 19.51 | %
New York |  |  | (16,164 | ) |  |  | 20.28 | % |  |  | (5,364 | ) |  |  | 14.62 | %
Pennsylvania |  |  | (26,380 | ) |  |  | 33.10 | % |  |  | (6,187 | ) |  |  | 16.87 | %
Other |  |  | 1,659 |  |  |  | (2.08) | % |  |  | 5,906 |  |  |  | (16.10) | %
State and local income taxes, net of federal benefit |  | $ | (79,693 | ) |  |  | 100.00 | % |  | $ | (36,681 | ) |  |  | 100.00 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | As of |
|  | December 31, |
|  | 2025 |  |  | 2024 |
Property, plant and equipment |  | $ | (950,593 | ) |  | $ | (1,833,727 | )
Federal general business tax credits |  |  | 901,466 |  |  |  | 842,565 |
Federal net operating loss carryforwards |  |  | 3,674,316 |  |  |  | 3,705,923 |
State tax credits and net operating loss carryforwards |  |  | 927,108 |  |  |  | 900,569 |
§174 R & D expenditures |  |  | 39,034 |  |  |  | 727,410 |
Deferred compensation |  |  | 52,872 |  |  |  | 82,370 |
Prepaid expenses and other |  |  | 74,110 |  |  |  | 24,718 |
UNICAP |  |  | 54,047 |  |  |  | 22,443 |
Incentive compensation |  |  | 154,275 |  |  |  | 121,718 |
Valuation allowance |  |  | (4,926,635 | ) |  |  | (4,593,989 | )
Deferred tax assets, net |  | $ | — |  |  | $ | — |

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