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Note 8 - Notes Payable and Convertible Notes Payable (Tables)
3 Months Ended
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