v3.23.1
Note 12 - Madryn Long-term Debt and Convertible Notes (Details Textual) - USD ($)
12 Months Ended
Dec. 09, 2020
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2020
Oct. 11, 2016
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001    
Madryn Credit Agreement [Member]          
Repayments of Debt $ 42,500,000        
Madryn Credit Agreement [Member] | Madryn Noteholders [Member]          
Debt Instrument, Face Amount         $ 70,000,000
Madryn Credit Agreement [Member] | Madryn Noteholders [Member] | Term A-1, A-2 and B Tranches of Debt [Member]          
Long-term Debt, Gross       $ 60,000,000  
Secured Subordinated Convertible Notes [Member] | Madryn Noteholders [Member]          
Debt Instrument, Default, Increase in Interest Rate 4.00%        
Debt Instrument, Termination, Minimum Principal Outstanding $ 10,000        
Debt Instrument, Convertible, Conversion Price (in dollars per share) $ 3.25        
Interest Expense, Total   $ 2,165,000 $ 2,158,000    
Repayments of Long-term Debt, Total   $ 0 $ 0    
Debt Instrument, Maturity Date Dec. 09, 2025        
Secured Subordinated Convertible Notes [Member] | Madryn Noteholders [Member] | Original Issuance Of Notes To Third Anniversary Date [Member]          
Debt Instrument, Interest Rate, Stated Percentage 8.00%        
Secured Subordinated Convertible Notes [Member] | Madryn Noteholders [Member] | After the Third Anniversary [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.00%