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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
December 31,
  
   
2018
    
2017
  
Accrued liabilities:
                
Accrued vacation payable
   $
2,211
     $
1,886
  
Accrued sales tax
    
1,753
      
550
  
Accrued property taxes
    
600
      
898
  
Workers compensation reserves
    
452
      
422
  
Provision for losses on uncompleted contracts
    
85
      
911
  
Other
    
2,446
      
1,896
  
Total accrued liabilities
   $
7,547
     $
6,563
  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
 
   
2018
    
2017
    
2016
  
                         
Income (loss) from continuing operations
   $
20,312
     $
(8,392
 )   $
(6,741
 )
Loss on discontinued operations
    
-
      
(1,771
 )    
(2,522
 )
Net income (loss)
   $
20,312
     $
(10,163
 )   $
(9,263
 )
                         
Basic weighted-average common shares outstanding
    
9,726
      
9,613
      
9,588
  
Effect of potentially dilutive common shares
(1)
    
7
      
-
      
-
  
Diluted weighted-average common shares outstanding
    
9,733
      
9,613
      
9,588
  
                         
Income (loss) per basic common share:
                        
Continuing operations
   $
2.09
     $
(0.88
 )   $
(0.71
 )
Discontinued operations
    
-
      
(0.18
 )    
(0.26
 )
Net income (loss) per share
   $
2.09
     $
(1.06
 )   $
(0.97
 )
                         
Income (loss) per diluted common share:
                        
Continuing operations
   $
2.09
     $
(0.88
 )   $
(0.71
 )
Discontinued operations
    
-
      
(0.18
 )    
(0.26
 )
Net income (loss) per share assuming dilution
   $
2.09
     $
(1.06
 )   $
(0.97
 )
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
 
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
  
   
Year Ended December 31, 2018
  
   
As Reported
   
Adjustments
   
Balance
Without
Adjustment for
Adoption of
Topic 606
 
Consolidated Statement of Operations
 
 
 
 
  
 
 
 
  
 
 
 
Net sales
   $
172,149
     $
766
     $
172,915
  
Cost of sales
    
160,053
      
532
      
160,585
  
Operating loss
    
(2,971
 )    
234
      
(2,737
 )
Income tax benefit
    
(3,252
 )    
1
      
(3,251
 )
Net income
    
20,312
      
233
      
20,545
  
   
December 31, 2018
  
   
As Reported
   
Adjustments
   
Balance
Without
Adjustment for
Adoption of
Topic 606
 
Consolidated Balance Sheet
 
 
 
 
  
 
 
 
  
 
 
 
Assets:
                        
Trade and other receivables, net
   $
34,394
     $
834
     $
35,228
  
Costs and estimated earnings in excess of billings on uncompleted contracts
    
-
      
76,033
      
76,033
  
Contract assets
    
74,271
      
(74,271
 )    
-
  
                         
Liabilities:
                        
Accrued liabilities
   $
7,547
     $
1,315
     $
8,862
  
Billings in excess of costs and estimated earnings on uncompleted contracts
    
-
      
3,660
      
3,660
  
Contract liabilities
    
3,745
      
(3,745
 )    
-
  
Deferred income taxes
    
68
      
258
      
326
  
                         
Stockholders' equity:
                        
Retained earnings
   $
101,194
     $
1,108
     $
102,302