Note 11 - Concentrations

12 Months Ended

Dec. 31, 2019

Notes to Financial Statements

Concentration Risk Disclosure [Text Block]

( 11 ) Concentrations

Most of the Company’s customers are located in the United States.

Two

customers accounted for

43%

and

25%

of total revenues in

2019.

One

customer accounted for approximately

29%

of revenue in

2018

and

no

single customer accounted for more than

10%

of revenue in

2017.

One

customer accounted for

15%

of accounts receivable at

December 31, 2019.

One

customer accounted for

23%

of accounts receivable at

December 31, 2018.