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Note 9 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Compensation and related expenses $ 5,830 $ 4,446
Professional fees 3,850 1,989
Income taxes payable 385
Research grants 393 400
Clinical trial costs 788 577
Other 443 349
Total 12,445 8,146
Accrued Expenses and Other Current Liabilities [Member]    
Lease liability - current $ 1,141