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Note 2 - Trade Accounts Receivable (Details) - Accounts Receivable Balances (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts Receivable Balances [Abstract]        
Billed $ 50,168 $ 44,374    
Unbilled 9,793 6,800    
Allowance for doubtful accounts (1,477) (1,157) (2,074) (2,418)
Total accounts receivable—net $ 58,484 $ 50,017