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Note 2 - Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | Estimated Useful Lives |  |  | As of |  |  | As of |
|  | (in years) |  |  | September 30, 2025 |  |  | December 31, 2024 |
Laboratory and manufacturing equipment |  | 3 - 10 |  |  | $ | 20,888,337 |  |  | $ | 21,234,259 |
Buildings and improvements |  | 10 - 39 |  |  |  | 20,960,522 |  |  |  | 20,889,395 |
Office furniture and equipment |  | 3 - 10 |  |  |  | 928,550 |  |  |  | 1,056,145 |
Construction in progress |  | n/a |  |  |  | 2,645,564 |  |  |  | 2,693,904 |
Land |  | n/a |  |  |  | 516,867 |  |  |  | 516,867 |
Property, plant and equipment, gross |  |  |  |  |  | 45,939,840 |  |  |  | 46,390,570 |
Accumulated depreciation |  |  |  |  |  | (21,599,100 | ) |  |  | (21,041,551 | )
Property, plant and equipment, net |  |  |  |  | $ | 24,340,740 |  |  | $ | 25,349,019 |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] |
|  | As of September 30, 2025 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market accounts |  | $ | 3,886,198 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,886,198 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank debt |  | $ | — |  |  | $ | 8,742,993 |  |  | $ | — |  |  | $ | 8,742,993 |
|  | As of December 31, 2024 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market accounts |  | $ | 3,758,232 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,758,232 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank debt |  | $ | — |  |  | $ | 9,465,500 |  |  | $ | — |  |  | $ | 9,465,500 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | During the Three-Month |  |  | During the Nine-Month |
|  | Periods Ended September 30, |  |  | Periods Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Company A |  |  | 41 | % |  |  | 43 | % |  |  | 46 | % |  |  | 44 | %
Company B |  |  | 26 | % |  |  | 31 | % |  |  | 27 | % |  |  | 33 | %
Total |  |  | 68 | % |  |  | 74 | % |  |  | 73 | % |  |  | 77 | %
|  | As of |  |  | As of |
|  | September 30, 2025 |  |  | December 31, 2024 |
Company A |  |  | 45 | % |  |  | 57 | %
Company B |  |  | 23 | % |  |  | 21 | %
Total |  |  | 68 | % |  |  | 78 | %
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | During the Three-Month |  |  | During the Nine-Month |
|  | Periods Ended September 30, |  |  | Periods Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Net (loss) income attributable to stockholders |  | $ | (139,748 | ) |  | $ | (701,690 | ) |  | $ | 1,809,115 |  |  | $ | (2,671,184 | )
Weighted average common shares outstanding - Basic |  |  | 9,045,851 |  |  |  | 8,164,423 |  |  |  | 9,019,484 |  |  |  | 7,908,425 |
Dilutive impact of share-based compensation awards |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Weighted average common shares outstanding - Diluted |  |  | 9,045,851 |  |  |  | 8,164,423 |  |  |  | 9,019,484 |  |  |  | 7,908,425 |
Net (loss) income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.02 | ) |  | $ | (0.09 | ) |  | $ | 0.20 |  |  | $ | (0.34 | )
Diluted |  | $ | (0.02 | ) |  | $ | (0.09 | ) |  | $ | 0.20 |  |  | $ | (0.34 | )
Re-Tain Assets [Member] |
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | Re-Tain® Assets as of |
|  | September 30, 2025 |
Land |  | $ | 448,201 |
Buildings and improvements |  |  | 12,725,789 |
Laboratory and manufacturing equipment |  |  | 9,744,390 |
Construction in progress |  |  | 2,316,951 |
Total |  |  | 25,235,331 |
Accumulated depreciation |  |  | (9,775,788 | )
Net book value |  | $ | 15,459,543 |

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