Note 14 - Employee 401(k) Plan

12 Months Ended

Dec. 31, 2020

Notes to Financial Statements

Retirement Benefits [Text Block]

14.  EMPLOYEE 401(k) PLAN

The Company sponsors a 401(k) retirement savings plan for all employees in the U.S. who meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax purposes. The Company is not required to contribute and did not contribute to the plan for the years ended December 31, 2020, 2019 and 2018.