Note 8 - Product Warranty Obligation

3 Months Ended

Mar. 31, 2019

Notes to Financial Statements

Product Warranty Disclosure [Text Block]

8.

Product Warranty Obligation

As of

March 31, 2019

and

December 31, 2018,

the product warranty liability was

$110

.

There was

no

change in product warranty liability during the

three

months ended

March 31, 2019

and

2018.