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Note 2 - Trade Accounts Receivable - Accounts Receivable Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Billed $ 48,538 $ 43,502    
Unbilled 8,599 6,359    
Allowance for doubtful accounts (994) (549) $ (1,611) $ (1,477)
Total accounts receivable—net $ 56,143 $ 49,312