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Note 5 - Debt (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Nov. 07, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2026
Dec. 31, 2025
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) [Member]      
Perceptive [Member]              
Stock Issued During Period, Shares, New Issues (in shares) 150,000            
Perceptive Credit Agreement [Member] | Perceptive Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   1,250,000   1,250,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 2.43   $ 2.43      
Line of Credit [Member] | Perceptive Credit Agreement [Member]              
Debt Instrument, Interest Rate Floor, Percent       5.00%      
Debt Instrument, Basis Spread on Variable Rate       7.00%      
Line of Credit Facility, Interest Rate at Period End   12.00%   12.00%      
Amortization of Debt Issuance Costs   $ 65,000 $ 64,000 $ 130,000 $ 129,000    
Amortization of Debt Discount (Premium)   $ 173,000 $ 158,000 $ 342,000 $ 314,000    
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year Two $ 37,000,000            
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year Three 52,400,000            
Debt Instrument, Covenant, Twelve Month Net Revenue Target, Year Four 60,300,000            
Debt Instrument, Minimum Cash Balance $ 3,000,000            
Line of Credit [Member] | Perceptive Credit Agreement [Member] | Forecast [Member]              
Debt Instrument, Maximum Operating Expense Covenant           $ 45,000,000 $ 40,000,000