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Note 14 - Recent Accounting and Reporting Developments (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
   
December 31,
2017
   
Effects of
Adoption of
Topic 606
   
January 1,
2018
 
Condensed Consolidated Balance Sheet
 
 
 
 
  
 
 
 
  
 
 
 
Assets:
                        
Trade and other receivables, net
   $
28,990
     $
(420
 )   $
28,570
  
Costs and estimated earnings in excess of billings on uncompleted contracts
    
44,502
      
(44,502
 )    
-
  
Contract assets
    
-
      
42,945
      
42,945
  
                         
Liabilities:
                        
Accrued liabilities
   $
6,563
     $
(783
 )   $
5,780
  
Billings in excess of costs and estimated earnings on uncompleted contracts
    
2,599
      
(2,599
 )    
-
  
Contract liabilities
    
-
      
2,537
      
2,537
  
Deferred income taxes
    
941
      
(257
 )    
684
  
                         
Stockholders' equity:
                        
Retained earnings
   $
81,757
     $
(875
 )   $
80,882
  
   
Three Months Ended September 30, 2018
    
Nine Months Ended September 30, 2018
  
   
As Reported
   
Adjustments
   
Balance
Without
Adjustment
for Adoption
of Topic 606
   
As Reported
   
Adjustments
   
Balance
Without
Adjustment
for Adoption
of Topic 606
 
Condensed Consolidated Statement of Operations
   
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net sales
   $
52,455
     $
(477
 )   $
51,978
     $
114,605
     $
743
     $
115,348
  
Cost of sales
    
47,252
      
(288
 )    
46,964
      
109,292
      
(156
 )    
109,136
  
Operating income (loss)
    
2,497
      
(189
 )    
2,308
      
(5,672
 )    
899
      
(4,773
 )
Income tax benefit
    
(3,456
 )    
(59
 )    
(3,515
 )    
(3,836
 )    
3
      
(3,833
 )
Net income
    
27,801
      
(130
 )    
27,671
      
20,164
      
896
      
21,060
  
   
September 30, 2018
    
   
As Reported
   
Adjustments
   
Balance
Without
Adjustment for
Adoption of
Topic 606
   
Condensed Consolidated Balance Sheet
 
 
 
 
  
 
 
 
  
 
 
  
 
Assets:
                          
Trade and other receivables, net
   $
33,955
     $
463
     $
34,418
    
Costs and estimated earnings in excess of billings on uncompleted contracts
    
-
      
66,200
      
66,200
    
Contract assets
    
64,130
      
(64,130
 )    
-
    
                           
Liabilities:
                          
Accrued liabilities
   $
6,063
     $
627
     $
6,690
    
Billings in excess of costs and estimated earnings on uncompleted contracts
    
-
      
677
      
677
    
Contract liabilities
    
802
      
(802
 )    
-
    
Deferred income taxes
    
67
      
260
      
327
    
                           
Stockholders' equity:
                          
Retained earnings
   $
101,046
     $
1,771
     $
102,817