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Note 3 - Accounts Receivable
12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
3.     
ACCOUNTS
RECEIVAB
LE
 
Accounts receivable consists of trade receivables as follows:
 
    December 31,  
 
 
2015
   
2014
 
                 
Billed receivables
  $ 7,740,837     $ 6,491,814  
Less: allowance for doubtful accounts
    (75,000 )     (25,000 )
    $ 7,665,837     $ 6,466,814