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Note 4 - Property (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30,
2019
   
December 31,
2018
 
   
(in thousands)
 
Land
  $
5,086
    $
5,059
 
Land improvements
   
24,727
     
24,727
 
Buildings
   
24,763
     
24,884
 
Machinery and equipment
   
11,295
     
11,143
 
Construction in progress
   
162
     
149
 
Total property
   
66,033
     
65,962
 
Less accumulated depreciation
   
37,490
     
36,741
 
Net property
  $
28,543
    $
29,221