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Note 17 - Major Customers and Accounts Receivables
 6 Months Ended
Jun. 30, 2020
Notes to Financial Statements  
Concentration Risk Disclosure [Text Block]
17.
MAJOR CUSTOMERS AND ACCOUNTS RECEIVABLE
 
For the
three
months ended
June 30, 2020
and
2019,
one
customer accounted for
41%
and 
two
customers accounted for
59%
of revenue, respectively. For the
six
months ended
June 30, 2020
and
2019,
three
customers accounted for
60%
and
58%
of revenue, respectively.
 
Three
customers accounted for
13%,
12%
and
10%
of current accounts receivable, respectively as of
June 30, 2020.
At
December 31, 2019,
three
customers accounted for 
18%,
16%
and
14%
of current accounts receivable, respectively.