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Note 13 - Recent Accounting and Reporting Developments (Tables)
 6 Months Ended
Jun. 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 June 30, 2018
    
Six Months Ended June 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
   $
28,785
     $
385
     $
29,170
     $
62,150
     $
1,220
     $
63,370
  
Cost of sales
    
30,023
      
145
      
30,168
      
62,040
      
132
      
62,172
  
Operating loss
    
(5,827
 )    
240
      
(5,587
 )    
(8,169
 )    
1,088
      
(7,081
 )
Income tax benefit
    
(108
 )    
(51
 )    
(159
 )    
(380
 )    
62
      
(318
 )
Net loss
    
(5,686
 )    
291
      
(5,395
 )    
(7,637
 )    
1,026
      
(6,611
 )
   
June 30, 2018
  
   
As Reported
   
Adjustments
   
Balance
Without
Adjustment for Adoption of
Topic 606
 
Condensed Consolidated Balance Sheet
 
 
 
 
  
 
 
 
  
 
 
 
Assets:
                        
Trade and other receivables, net
   $
16,334
     $
225
     $
16,559
  
Costs and estimated earnings in excess of billings on uncompleted contracts
    
-
      
47,187
      
47,187
  
Contract assets
    
44,320
      
(44,320
 )    
-
  
                         
Liabilities:
                        
Accrued liabilities
   $
5,013
     $
915
     $
5,928
  
Billings in excess of costs and estimated earnings on uncompleted contracts
    
-
      
142
      
142
  
Contract liabilities
    
184
      
(184
 )    
-
  
Deferred income taxes
    
233
      
318
      
551
  
                         
Stockholders' equity:
                        
Retained earnings
   $
73,245
     $
1,901
     $
75,146