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 ($)
ft²
Feb. 29, 2020
USD ($)
ft²
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jul. 31, 2021
Mar. 31, 2019
USD ($)
Aug. 31, 2015
ft²
Operating Lease, Payments | $     $ 0.5 $ 0.6 $ 1.6 $ 1.9      
Hallbergmoos Germany [Member] | Leases Expected to be Delivered by October 2024 [Member]                  
Area of Real Estate Property (Square Foot) | ft² 22,300 22,300              
Hallbergmoos Germany [Member] | Leases with First Right of Refusal for Additional Area [Member]                  
Area of Real Estate Property (Square Foot) | ft² 13,400 13,400              
Sublease Office Space [Member] | Boston Massachusetts [Member]                  
Area of Real Estate Property (Square Foot) | ft²                 3,950
Lessee, Operating Lease, Renewal Term (Month)             10 months    
Office and Laboratory Space [Member] | Hallbergmoos Germany [Member]                  
Area of Real Estate Property (Square Foot) | ft² 105,000 105,000              
Lessee, Operating Lease, Renewal Term (Month) 60 months 60 months              
Number of Agreement Extension Options 2                
Lessee, Operating Lease, Monthly Rent Expense | $   $ 0.2              
Security Deposit | $ $ 0.8 $ 0.8              
Tenant Improvements | $               $ 11.5