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Note 13 - Segment Information (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
2019
    
2018
    
2017
  
   
(In thousands)
  
Revenue:
                        
United States
   $
124,369
     $
115,451
     $
112,885
  
Canada
    
3,613
      
4,235
      
4,674
  
Total
   $
127,982
     $
119,686
     $
117,559
  
Long-lived assets:
                        
United States
   $
78,906
     $
77,330
     $
72,562
  
Canada
    
2,622
      
2,291
      
2,495
  
Total
   $
81,528
     $
79,621
     $
75,057
  
Total assets:
                        
United States
   $
95,668
     $
91,080
     $
110,785
  
Canada
    
15,017
      
16,952
      
16,531
  
Total
   $
110,685
     $
108,032
     $
127,316