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Note 7 - 401(k) Retirement Plan (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Contribution Plan, Eligibility Service Period 90 days  
Defined Contribution Plan, Eligibility Age of Employee 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 $ 152 $ 286