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Note 4 - Accounts Receivable
 6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4.
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. As a result of the payment delays for a large customer, the Company has continued to reserve 
$1,000,000
at 
June 30, 2018, 
which represents 
58%
 of the remaining balance owed under the contract. Recoveries of accounts receivable previously written off are recorded when received. Accounts receivable at
June 30, 2018
and
December 31, 2017
consisted of the following:
 
   
June 30,
    
December 31,
  
   
201
8
    
201
7
  
                 
Accounts receivable - current
   $
505,436
     $
2,889,731
  
Accounts receivable - non current
    
1,720,000
      
1,760,000
  
     
2,225,436
      
4,649,731
  
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,000,000
)
    
(1,000,000
)
     
(1,013,785
)
    
(1,013,785
)
Accounts receivable, net of allowance for doubtful accounts
   $
1,211,651
     $
3,635,946