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Note 2 - Trade Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
                 
Billed
  $ 43,502     $ 49,302  
Unbilled
    6,359       5,292  
Allowance for doubtful accounts
    (549 )     (1,611 )
                 
Total accounts receivable—net
  $ 49,312     $ 52,983  
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent [Table Text Block]
 
 
2015
 
 
2014
 
 
2013
 
 
 
(in thousands)
 
                         
Balance—beginning of year
  $ 1,611     $ 1,477     $ 1,157  
Provision for bad debts
    151       456       424  
Charge-offs
    (1,231 )     (322 )     (104 )
Recoveries
    18       -       -  
Balance—end of year
  $ 549     $ 1,611     $ 1,477