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Note 2 - Trade Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
2016
 
 
2015
 
 
 
(in thousands)
 
                 
Billed
  $
48,538
    $
43,502
 
Unbilled
   
8,599
     
6,359
 
Allowance for doubtful accounts
   
(994
)    
(549
)
                 
Total accounts receivable—net
  $
56,143
    $
49,312
 
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent [Table Text Block]
 
 
2016
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
                         
Balance—beginning of year
  $
549
    $
1,611
    $
1,477
 
Provision for bad debts
   
445
     
151
     
456
 
Charge-offs
   
-
     
(1,231
)    
(322
)
Recoveries
   
-
     
18
     
-
 
                         
Balance—end of year
  $
994
    $
549
    $
1,611