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Note 5 - Accounts Receivable
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
5.
ACCOUNTS RECEIVABLE
 
Accounts receivable are carried at original amount less an estimate made for doubtful receivables based on a review of all outstanding amounts on a monthly basis. Management determines the allowance for doubtful receivables by regularly evaluating individual customer receivables and considering a customer's financial condition, credit history, and current economic conditions. Accounts receivable are written off when deemed uncollectible.
 
Accounts receivable at
March 31, 2021
and
December 31, 2020
consisted of the following: 
 
   
March 31,
   
December 31,
 
   
2021
   
2020
 
Accounts receivable
  $
1,446,033
    $
561,834
 
Allowance for doubtful accounts
   
(13,785
)
   
(13,785
)
Accounts receivable, net of allowances for doubtful accounts
  $
1,432,248
    $
548,049