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Note 4 - Property (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
   
(unaudited)
   
(audited)
 
   
(in thousands)
 
Land
  $
5,073
    $
5,073
 
Land improvements
   
13,153
     
13,153
 
Buildings
   
23,439
     
23,439
 
Machinery and equipment
   
10,529
     
10,495
 
Construction-in-progress
   
8
     
4
 
Total property
   
52,202
     
52,164
 
Less accumulated depreciation
   
32,768
     
32,445
 
Property, net
  $
19,434
    $
19,719