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Note 8 - 401(k) Retirement Plan (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Contribution Plan, Eligibility Service Period (Month) 90 days  
Defined Contribution Plan, Eligibility Age of Employee (Year) 18 years  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 60.00%  
Defined Contribution Plan, Employer Matching Contribution Rate 25.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 6.00%  
Defined Contribution Plan, Cost $ 267 $ 152