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Note 12 - Employee Benefit Plan (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%  
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 0 $ 0