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Note 6 - Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    March 31,
2020
  December 31,
2019
    (in thousands)
Machinery and equipment   $
7,437
    $
7,198
 
Computer equipment and software    
8,763
     
8,954
 
Leasehold improvements    
2,157
     
2,151
 
Furniture and fixtures    
1,309
     
1,321
 
Automobiles    
90
     
92
 
     
19,756
     
19,716
 
Less: accumulated depreciation    
(15,268
)    
(14,940
)
Property, plant and equipment, net   $
4,488
    $
4,776