v3.25.2
Note 8 - Notes Payable and Convertible Notes Payable (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2024
Sep. 30, 2024
Dec. 08, 2023
Feb. 28, 2019
Dec. 31, 2024
Nov. 30, 2024
Oct. 31, 2024
Jun. 30, 2023
May 31, 2022
Sep. 30, 2021
May 31, 2021
Apr. 30, 2019
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         7,242,876               7,242,876     7,242,876      
Fair Value Adjustment of Warrants                         $ 515,000   $ (1,568,000) $ (1,995,000) $ (259,000)    
New Avenue Warrant [Member]                                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                                   150,000  
Avenue [Member] | Warrants Issued with 2021 Avenue Loan [Member]                                      
Warrants and Rights Outstanding                     $ 1,500,000                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                     150,000                
Avenue [Member] | New Avenue Warrant [Member]                                      
Warrants and Rights Outstanding               $ 700,000                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 4.6014                 $ 16     $ 4.6014          
Fair Value Adjustment of Warrants                           $ 100,000          
Avenue [Member] | Minimum [Member] | Public Equity Offering [Member]                                      
Equity Milestone 1 Condition for Extended Interest Only Period               $ 35,000,000                      
The 2019 Cecil Loan [Member] | Advance Cecil Inc. [Member]                                      
Debt Instrument, Face Amount                       $ 100,000              
Debt Instrument, Interest Rate, Stated Percentage                       8.00%              
Phantom Shares for Potential Repayment (in shares)                       1,199              
Interest Expense, Debt                         10,000   10,000 20,000 20,000    
The 2019 MD Loan [Member] | Department of Housing and Community Development [Member]                                      
Debt Instrument, Face Amount       $ 500,000                              
Debt Instrument, Interest Rate, Stated Percentage       8.00%                              
Phantom Shares for Potential Repayment (in shares)       5,995                              
Interest Expense, Debt                         2,000   2,000 4,000 4,000    
The 2022 MD Loan [Member] | Department of Housing and Community Development [Member]                                      
Debt Instrument, Face Amount                 $ 3,000,000                    
Debt Instrument, Interest Rate, Stated Percentage                 6.00%                    
Interest Expense, Debt                         14,000   16,000 29,000 31,000    
Proceeds from Loans                               1      
Debt Instrument, Unfunded Balance                         2,000,000     2,000,000      
Debt Instrument, Monthly Interest-only Payments, Maximum Amount, First Eighteen Installments                 $ 15,000                    
Debt Instrument, Monthly Principal and Interest Payment, for the Next Thirty Installments                 33,306                    
Interest Payable         $ 50,000               $ 50,000     $ 50,000      
Debt Issuance Costs, Gross                 $ 31,000                    
The 2022 DHCD Loan [Member] | Convertible Notes Payable [Member]                                      
Debt Instrument, Interest Rate, Stated Percentage                         6.00%     6.00%      
The 2022 DHCD Loan [Member] | Department of Housing and Community Development [Member]                                      
Debt Instrument, Face Amount     $ 5,000,000                               $ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage                                     6.00%
Interest Expense, Debt                         $ 0.1   0.1 $ 200,000 200,000    
Interest Payable         $ 300,000               300,000     300,000      
Debt Issuance Costs, Gross                         100,000     100,000      
Debt Instrument, Convertible, Minimum Increment of Principal for Exercise     $ 1,000,000                                
Debt Conversion, Conversion Price, Percent of 30-day Trailing Volume-weighted Average Sale Price of Common Stock     97.00%                                
Debt Instrument, Convertible, Conversion Price (in dollars per share)     $ 80                                
Coupon Interest Expense                         0.1   0.1 200,000 200,000    
Amortization of Debt Issuance Costs and Discounts                         $ 3,000   $ 3,000 $ 6,000 $ 5,000    
Debt Instrument, Interest Rate, Effective Percentage         5.99%               5.99%   5.99% 5.99% 5.99%    
The 2021 Avenue Loan [Member] | Avenue [Member]                                      
Debt Instrument, Face Amount                     $ 30,000,000                
Debt Instrument, Interest Rate, Stated Percentage                     3.25%                
Interest Expense, Debt                             $ 1,200,000   $ 2,300,000    
Debt Instrument, Basis Spread on Variable Rate                     6.60%                
Debt Issuance Costs, Net                     $ 800,000                
Debt Issuance Costs Expensed                     $ 47,000                
Debt Instrument, Interest Only Payments, Period (Month)                     12 months                
Debt Instrument, First Interest-only Period Extension (Month)                     12 months                
Debt Instrument, Periodic Payment, Principal $ 3,300,000 $ 3,300,000       $ 500,000 $ 2,000,000             $ 3,300,000          
Repayments of Debt         $ 7,900,000                            
Debt Instrument, Final Payment, Percentage of Funded Principal         4.25%                            
Debt Instrument, Final Payment         $ 900,000                            
Debt Instrument, Early Termination Fee, Percentage of Outstanding Principal         1.00%                            
Gain (Loss) on Extinguishment of Debt         $ (200,000)                            
Debt Instrument, Convertible, Maximum Conversion Amount                     $ 5,000,000                
The 2021 Avenue Loan [Member] | Avenue [Member] | Convertible Notes Payable [Member]                                      
Interest Expense, Debt                             200,000   400,000    
Coupon Interest Expense                             100,000   300,000    
Amortization of Debt Issuance Costs and Discounts                             $ 100,000   $ 0.1    
Debt Instrument, Interest Rate During Period                             22.79%   22.79%    
The 2021 Avenue Loan [Member] | Avenue [Member] | Notes Payable, Tranche 1 [Member]                                      
Proceeds from Notes Payable, Total                   $ 5,000,000 15,000,000                
The 2021 Avenue Loan [Member] | Avenue [Member] | Notes Payable, Tranche 2 [Member]                                      
Debt Instrument, Unfunded Balance                     $ 10,000,000                
The 2024 S S C P Notes [Member]                                      
Debt Instrument, Face Amount         $ 10,000,000                            
Debt Instrument, Interest Rate, Stated Percentage         12.00%                            
Interest Expense, Debt                         $ 300,000   $ 600,000        
Interest Payable         $ 37,000               $ 37,000     $ 37,000      
Debt Instrument, Convertible, Conversion Price (in dollars per share)                         $ 5.668     $ 5.668      
Debt Issuance Costs, Net         1,500,000                            
Debt Instrument, Periodic Payment, Principal         $ 1,000,000                            
Debt Instrument, Convertible, Maximum Conversion Amount                         $ 6,500,000     $ 6,500,000      
Debt Instrument, Covenant, Cash and Certain Cash Equivalents, Minimum                         $ 2,000,000     $ 2,000,000      
Debt Instrument, Default Feature, Penalty Amount, Percentage of Principal and Interest Outstanding                         10.00%     10.00%      
Debt Instrument, Collateral Deficiency Fee, Percentage                         10.00%     10.00%      
Debt Instrument, Convertible, Maximum Conversion Amount, Percentage of Principal Oustanding                         65.00%     65.00%      
Debt Instrument, Cash Payment in the Event of Change in Control or Restructuring Process, Percentage Of Principal Outstanding                               115.00%      
Debt Instrument, Registration Fee Penalty Amount, Percentage of Face Value of Debt                         2.00%     2.00%      
Debt Instrument, Aggregate Registration Fee Penalty Amount, Maximum Percentage of Face Value of Debt                         10.00%     10.00%      
The 2024 S S C P Notes [Member] | Derivative Instrument Related to Senior Secured Convertible Promissory Notes [Member]                                      
Derivative Liability                         $ 1,400,000     $ 1,400,000      
The 2024 S S C P Notes [Member] | Convertible Notes Payable [Member]                                      
Interest Expense, Debt                         400,000     700,000      
Coupon Interest Expense                         $ 200,000     $ 400,000      
Debt Instrument, Interest Rate, Effective Percentage                         24.65%     24.65%      
Amortization of Debt Issuance Costs                         $ 200,000     $ 300,000