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Note 3 - Trade Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
20
1
8
   
20
1
7
 
   
(
i
n thousands)
 
                 
Billed
  $
56,766
    $
51,236
 
Unbilled
   
8,808
     
9,154
 
Allowance for doubtful accounts
   
(2,224
)    
(1,335
)
                 
Total accounts receivable—net
  $
63,350
    $
59,055
 
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent [Table Text Block]
   
20
1
8
   
20
1
7
   
20
1
6
 
   
(
i
n thousands)
 
                         
Balance—beginning of year
  $
1,335
    $
994
    $
549
 
Provision for bad debts
   
889
     
341
     
445
 
Charge-offs
   
-
     
-
     
-
 
Recoveries
   
-
     
-
     
-
 
                         
Balance—end of year
  $
2,224
    $
1,335
    $
994