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Note 2 - Business Combination (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Assets
 
 
 
 
Cash and cash equivalents
  $
912
 
Trade and other receivables
   
12,806
 
Contract assets
   
11,858
 
Inventories
   
9,895
 
Prepaid expenses and other
   
452
 
Property and equipment
   
34,709
 
Other assets
   
218
 
Total assets acquired
   
70,850
 
         
Liabilities
 
 
 
 
Accounts payable
   
5,520
 
Accrued liabilities
   
1,894
 
Contract liabilities
   
123
 
Deferred income taxes
   
3,298
 
Total liabilities assumed
   
10,835
 
         
Bargain purchase gain
   
(21,880
)
         
Total purchase consideration
  $
38,135
 
Business Acquisition, Pro Forma Information [Table Text Block]
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Net sales
  $
57,250
    $
53,071
    $
142,969
    $
142,836
 
Net income (loss) from continuing operations
   
6,822
     
1,229
     
(18,059
)    
(5,050
)
Net income (loss) from continuing operations per basic share
   
0.70
     
0.13
     
(1.86
)    
(0.53
)
Net income (loss) from continuing operations per diluted share
   
0.70
     
0.13
     
(1.86
)    
(0.53
)