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Note 9 - 401(k) Retirement Plan (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Contribution Plan, Eligibility Service Period (Month) 3 months  
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 $ 276 $ 267