Note 12 - Defined Contribution Retirement Plan

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Pension and Other Postretirement Benefits Disclosure [Text Block]

12.

 Defined Contribution Retirement Plan

The Company has established a

401

(k)

 defined contribution plan (the

401

(k) Plan) that covers all employees who qualify under the terms of the plan. Eligible employees

may

elect to contribute to the

401

(k) Plan up to

90%

of their compensation, limited by the IRS-imposed maximum. The Company provides a safe harbor match with a maximum amount of

4%

of the participant’s compensation. The Company made matching contributions under the

401

(k) Plan of approximately

$49,000

and

$28,000

for the years ended

December 

31,

2017

and

2016,

respectively.