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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable - Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Allowance for sales discounts and doubtful accounts $ (1,061) $ (1,402)
Accounts receivable, net 41,942 45,170
Billed Revenues [Member]    
Accounts Receivable, Gross, Current 29,322 34,463
Unbilled Revenues [Member]    
Accounts Receivable, Gross, Current 8,911 6,894
Work In Progress [Member]    
Accounts Receivable, Gross, Current $ 4,770 $ 5,215