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Note 13 - Litigation Settlement (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 10, 2022
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Mar. 31, 2022
Litigation Settlement, Expense   $ (544,000)   $ 0 $ (233,000) $ 0    
Series E Preferred Stock in Biostage [Member]                
Equity Securities without Readily Determinable Fair Value, Amount   $ 4,000,000.0     $ 4,000,000.0      
Convertible Preferred Stock [Member] | Biostage [Member]                
Preferred Stock, Dividend Rate, Percentage         8.00%      
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 1,000     $ 1,000      
Preferred Stock, Mandatory Conversion, Minimum Qualified Offering Amount   $ 4,000,000     $ 4,000,000      
Case in Suffolk Superior Court [Member]                
Loss Contingency, Estimate of Possible Loss               $ 5,200,000
Legal Fees             $ 300,000  
Litigation Settlement, Expense     $ (4,900,000)          
Case in Suffolk Superior Court [Member] | Convertible Preferred Stock [Member]                
Stock Issued During Period, Shares, Issued For Settlement (in shares) 4,000              
Stock Issued During Period, Value, Issued for Settlement $ 4,000,000.0              
Estimated Litigation Liability   $ 500,000     $ 500,000