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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
Net sales
   $
22,225
 
Cost of sales
    
23,881
 
Gross loss
    
(1,656
 )
Selling, general and administrative expense
    
396
 
Operating loss
    
(2,052
 )
Loss on sale of business
    
(13,497
 )
Interest expense
    
(99
 )
Loss before income taxes
    
(15,648
 )
Income tax benefit
    
(3,934
 )
Loss on discontinued operations
   $
(11,714
 )
Schedule of Accrued Liabilities [Table Text Block]
 
 
December 31,
 
 
 
2016
 
 
2015
 
Accrued liabilities:
                
Accrued vacation payable
   $
2,313
    $
3,029
 
Reserves for expected losses on uncompleted contracts
    
1,409
     
5,933
 
Litigation accrual
    
1,750
     
-
 
Accrued property taxes
    
1,096
     
1,280
 
Contingent consideration payable
    
84
     
1,211
 
Other
    
4,273
     
4,518
 
Total accrued liabilities
   $
10,925
    $
15,971
 
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
2016
 
 
2015
 
 
2014
 
                         
Loss from continuing operations
   $
(9,263
 )   $
(29,388
 )   $
(6,173
 )
Loss from discontinued operations
    
-
     
-
     
(11,714
 )
Net loss
   $
(9,263
 )   $
(29,388
 )   $
(17,887
 )
                         
Basic weighted-average common shares outstanding
    
9,588
      
9,560
      
9,515
  
Effect of potentially dilutive common shares
(1)
    
-
     
-
     
-
 
Diluted weighted-average common shares outstanding
    
9,588
      
9,560
      
9,515
  
                         
Loss per basic and diluted common share:
                        
Continuing operations
   $
(0.97
 )   $
(3.07
 )   $
(0.65
 )
Discontinued operations
    
-
     
-
     
(1.23
 )
Total
   $
(0.97
 )   $
(3.07
 )   $
(1.88
 )
                         
Antidilutive shares excluded from net loss per diluted common share calculation
    
27
      
52
      
65