Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Leases (Details Textual)

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Note 10 - Leases (Details Textual)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2020
USD ($)
ft²
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2019
USD ($)
Aug. 31, 2015
ft²
Operating Lease, Payments   $ 0.5 $ 0.5 $ 1.6 $ 1.6    
Sublease Office Space [Member] | Boston Massachusetts [Member]              
Area of Real Estate Property (Square Foot) | ft²             3,950
Office and Laboratory Space [Member] | Hallbergmoos Germany [Member]              
Area of Real Estate Property (Square Foot) | ft² 105,000            
Lessee, Operating Lease, Term of Contract (Year) 12 years 6 months            
Lessee, Operating Lease, Monthly Rent Expense $ 0.2            
Security Deposit $ 0.8            
Tenant Improvements           $ 11.5  
Operating Lease, Impairment Loss   1.8          
Lessee, Operating Lease, Lease Not yet Commenced, Amount   $ 3.9   $ 3.9