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Note 6 - Related Party Transactions (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
The Multi Channel Systems Facility and Triangle BioSystems Lease Agreements [Member]        
Operating Lease, Expense $ 0.1 $ 0.1 $ 0.2 $ 0.2