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Note 8 - Notes Payable and Convertible Notes Payable - Schedule of Future Payments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Future debt payments, net | $ 16,927 | $ 16,915
The 2019 MD Loan [Member] | Notes Payable [Member] |  |
2024 (remainder) | 0 |
2025 | 0 |
2026 | 0 |
2027 | 0 |
2028 | 0 |
2029 | 0 |
Thereafter | 500 |
Total debt principal payments | 500 |
Accrued and unpaid interest | 204 |
Less unamortized discount and debt issuance costs | 0 |
Future debt payments, net | 704 |
The 2019 Cecil Loan [Member] | Notes Payable [Member] |  |
2024 (remainder) | 0 |
2025 | 0 |
2026 | 0 |
2027 | 0 |
2028 | 0 |
2029 | 0 |
Thereafter | 100 |
Total debt principal payments | 100 |
Accrued and unpaid interest | 40 |
Less unamortized discount and debt issuance costs | 0 |
Future debt payments, net | 140 | $ 138
The 2021 Avenue Loan [Member] | Notes Payable [Member] |  |
2024 (remainder) | 20,000 |
2025 | 0 |
2026 | 0 |
2027 | 0 |
2028 | 0 |
2029 | 0 |
Thereafter | 0 |
Total debt principal payments | 20,000 |
Accrued and unpaid interest | 0 |
Less unamortized discount and debt issuance costs | (134) |
Future debt payments, net | 19,866 |
The 2022 MD Loan [Member] | Notes Payable [Member] |  |
2024 (remainder) | 0 |
2025 | 347 |
2026 | 369 |
2027 | 317 |
2028 | 0 |
2029 | 0 |
Thereafter | 0 |
Total debt principal payments | 1,033 |
Accrued and unpaid interest | 50 |
Less unamortized discount and debt issuance costs | (20) |
Future debt payments, net | 1,063 |
The 2022 DHCD Loan [Member] | Notes Payable [Member] |  |
2024 (remainder) | 0 |
2025 | 0 |
2026 | 0 |
2027 | 0 |
2028 | 5,000 |
2029 | 0 |
Thereafter | 0 |
Total debt principal payments | 5,000 |
Accrued and unpaid interest | 388 |
Less unamortized discount and debt issuance costs | (47) |
Future debt payments, net | $ 5,341 |

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