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Note 2 - Property, Plant and Equipment
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
2
.     
Property, Plant and Equipment
 
   
Depreciable
               
   
lives
 
(in thousands)
 
   
(in years)
 
201
7
   
201
6
 
Machinery and equipment
 
 5
to
12
 
$
2,632
    $
2,675
 
Leasehold improvements
 
 9
to
15
 
 
1,842
     
1,833
 
Property, plant and equipment, at cost
 
 
 
 
 
 
4,474
     
4,508
 
Less accumulated depreciation
 
 
 
 
 
 
3,025
     
2,902
 
Property, plant and equipment, net
 
 
 
 
 
$
1,449
    $
1,606