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Note 8 - Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,
    2019   2018
    (in thousands)
Machinery and equipment   $
7,198
    $
9,678
 
Computer equipment and software    
8,954
     
9,685
 
Leasehold improvements    
2,151
     
2,468
 
Furniture and fixtures    
1,321
     
1,390
 
Automobiles    
92
     
115
 
     
19,716
     
23,336
 
Less: accumulated depreciation    
(14,940
)    
(17,438
)
Property, plant and equipment, net   $
4,776
    $
5,898