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Note 8 - Notes Payable and Convertible Notes Payable (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 30, 2019
Feb. 28, 2019
Jun. 30, 2023
Dec. 31, 2022
May 31, 2022
Sep. 30, 2021
May 31, 2021
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Proceeds from Notes Payable, Total               $ 0   $ 350,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               105,432,083 105,432,083  
New Avenue Warrant [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 3,000,000  
Avenue [Member] | Warrants Issued with 2021 Avenue Loan [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             115,851      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 8.63      
Warrants and Rights Outstanding             $ 1,500,000      
Avenue [Member] | New Avenue Warrant [Member]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             3,000,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 0.8      
Warrants and Rights Outstanding             $ 700,000      
Avenue [Member] | Minimum [Member] | Public Equity Offering [Member]                    
Equity Milestone 1 Condition for Extended Interest Only Period     $ 35,000,000              
Equity Milestone 2 Condition for Extended Interest Only Period     $ 40,000,000              
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)   119,907                
Interest Expense, Debt               $ 10,000   10,000
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) 23,981                  
Interest Expense, Debt               2,000   2,000
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               15,000   12,000
Proceeds from Loans               1,000,000    
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  
Debt Issuance Costs, Gross         $ 31,000          
The 2022 DHCD Loan [Member] | Convertible Notes Payable [Member]                    
Debt Instrument, Interest Rate, Stated Percentage               6.00%    
The 2022 DHCD Loan [Member] | Department of Housing and Community Development [Member]                    
Debt Instrument, Face Amount       $ 5,000,000            
Debt Instrument, Interest Rate, Stated Percentage       6.00%            
Interest Expense, Debt               $ 100,000   100,000
Interest Payable               400,000 $ 300,000  
Debt Issuance Costs, Gross       $ 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)       $ 4            
Coupon Interest Expense               100,000   100,000
Amortization of Debt Issuance Costs and Discounts               $ 3,000   3,000
Debt Instrument, Interest Rate, Effective Percentage               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               $ 1,100,000   1,000,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)               $ 10.36    
Debt Instrument, Basis Spread on Variable Rate             6.60%      
Debt Instrument, Interest Rate During Period               15.10% 14.10%  
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      
Additional Payment at Debt Maturity, Percentage of Principal             4.25%      
Additional Payment at Debt Maturity             $ 900,000      
Debt Instrument, Convertible, Maximum Conversion Amount               $ 5,000,000    
Debt Instrument, Covenant, Cash and Certain Cash Equivalents, Minimum               5,000,000    
The 2021 Avenue Loan [Member] | Avenue [Member] | Convertible Notes Payable [Member]                    
Interest Expense, Debt               300,000   200,000
Coupon Interest Expense               200,000   200,000
Amortization of Debt Issuance Costs and Discounts               $ 100,000   $ 100,000
Debt Instrument, Interest Rate During Period               22.79%   20.17%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net               $ 33,000 $ 100,000  
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