Note 15 - Employee 401(k) Plan

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Pension and Other Postretirement Benefits Disclosure [Text Block]

15.

  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, 2018,

2017

and

2016.