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Note 3 - Accounts Receivable
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
3.
  
 
ACCOUNTS RECEIVABLE
 
The Company establishes an allowance for doubtful accounts based upon factors surrounding the credit risk of specific customers, historical trends and other information. The reserve for doubtful accounts was
$35,000
and
$10,275
at
December 31, 2018
and
2017,
respectively