Note 11 - Major Customers and Accounts Receivable

3 Months Ended

Mar. 31, 2021

Notes to Financial Statements

Concentration Risk Disclosure [Text Block]

11. MAJOR CUSTOMERS AND ACCOUNTS RECEIVABLE

The Company had certain customers whose revenue individually represented

10%

or more of the Company's total revenue, or whose accounts receivable balances individually represented

10%

or more of the Company's total accounts receivable as follows:

For the

three

months ended

March 31, 2021

and

2020,

one

customer accounted for

21%

and

2%

of revenue, a

second

customer accounted for

15%

and

6%

of revenue, and a

third

customer accounted for

3%

and

50%,

respectively.

At

March 31, 2021,

three

customers accounted for

67%

of accounts receivable.  At

December 31, 2020,

three

customers accounted for

72%

of accounts receivable.