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Note 8 - Notes Payable and Convertible Notes Payable (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
|  | Stated |  |  | March 31, |  |  | December 31, |
(in thousands, except interest rates) |  | Interest Rate |  |  | 2024 |  |  | 2023 |
Notes payable |  |  |  |  |  |  |  |  |  |  |  |
Advance Cecil, Inc. (commenced April 2019) |  |  | 8.00 | % |  | $ | 140 |  |  | $ | 138 |
Maryland DHCD (commenced February 2019) |  |  | 8.00 | % |  |  | 704 |  |  |  | 694 |
Maryland DHCD (commenced May 2022) |  |  | 6.00 | % |  |  | 1,083 |  |  |  | 1,083 |
Avenue Venture Opportunities Fund, L.P. (commenced May 2021) |  |  | 15.10 | % |  |  | 15,000 |  |  |  | 15,000 |
|  |  |  |  |  |  | 16,927 |  |  |  | 16,915 |
Less unamortized discount and debt issuance costs |  |  |  |  |  |  | (120 | ) |  |  | (394 | )
Less notes payable, current portion, net of unamortized discount and debt issuance costs |  |  |  |  |  |  | (14,987 | ) |  |  | (14,627 | )
Total notes payable, net of current portion |  |  |  |  |  | $ | 1,820 |  |  | $ | 1,894 |
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |
Avenue Venture Opportunities Fund, L.P. (commenced May 2021) |  |  | 15.10 | % |  | $ | 5,000 |  |  | $ | 5,000 |
Maryland DHCD (commenced December 2022) |  |  | 6.00 | % |  |  | 5,388 |  |  |  | 5,308 |
|  |  |  |  |  |  | 10,388 |  |  |  | 10,308 |
Less unamortized discount and debt issuance costs |  |  |  |  |  |  | (81 | ) |  |  | (174 | )
Less convertible notes payable, current portion, net of unamortized discount and debt issuance costs |  |  |  |  |  |  | (5,042 | ) |  |  | (4,876 | )
Total convertible notes payable, net of current portion |  |  |  |  |  | $ | 5,265 |  |  | $ | 5,258 |
Schedule of Maturities of Long-Term Debt [Table Text Block] |
(in thousands) |  | 2019 MD Loan |  |  | 2019 Cecil Loan |  |  | 2021 Avenue Loan |  |  | 2022 MD Loan |  |  | 2022 DHCD Loan |
2024 (remainder) |  | $ | — |  |  | $ | — |  |  | $ | 20,000 |  |  | $ | — |  |  | $ | — |
2025 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 347 |  |  |  | — |
2026 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 369 |  |  |  | — |
2027 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 317 |  |  |  | — |
2028 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,000 |
2029 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Thereafter |  |  | 500 |  |  |  | 100 |  |  |  | — |  |  |  | — |  |  |  | — |
Total debt principal payments |  |  | 500 |  |  |  | 100 |  |  |  | 20,000 |  |  |  | 1,033 |  |  |  | 5,000 |
Accrued and unpaid interest |  |  | 204 |  |  |  | 40 |  |  |  | — |  |  |  | 50 |  |  |  | 388 |
Less unamortized discount and debt issuance costs |  |  | — |  |  |  | — |  |  |  | (134 | ) |  |  | (20 | ) |  |  | (47 | )
Future debt payments, net |  | $ | 704 |  |  | $ | 140 |  |  | $ | 19,866 |  |  | $ | 1,063 |  |  | $ | 5,341 |

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