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Note 3 - Accounts Receivable
 6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
3.
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. During the year ended
December 31, 2016,
the Company reclassified a past due receivable to non-current as management concluded that collection
may
not
occur in the near term. As a result of the payment delays, the Company had reserved
$500,000
at
December 31, 2016
and in the
six
months ended
June 30, 2017, 
the Company reserved an additional
$500,000.
The total reserve represents
48%
of the remaining balance owed at
June 30, 2017.
Recoveries of accounts receivable previously written off are recorded when received. Accounts receivable consisted of the following as of:
 
 
 
 
June 30,
 
 
December 31,
 
 
 
2017
 
 
2016
 
                 
Accounts receivable - current
   $
861,674
     $
1,577,031
  
Accounts receivable - non current
    
2,070,000
      
2,070,000
  
     
2,931,674
      
3,647,031
  
Allowance for doubtful accounts - current
    
(13,785
)
    
(13,785
)
Allowance for doubtful accounts - non current
    
(1,000,000
)
    
(500,000
)
Accounts receivable, net of allowance for doubtful accounts
   $
1,917,889
     $
3,133,246