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Note 14 - Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
   
201
7
    
201
6
    
20
15
  
   
(In thousands)
  
Revenue:
                        
United States
   $
112,885
     $
104,445
     $
97,097
  
Canada
    
4,674
      
4,939
      
5,246
  
Total
   $
117,559
     $
109,384
     $
102,343
  
Long-lived assets:
                        
United States
   $
72,562
     $
71,192
     $
70,624
  
Canada
    
2,495
      
2,367
      
2,364
  
Total
   $
75,057
     $
73,559
     $
72,988
  
Total assets:
                        
United States
   $
110,785
     $
106,288
     $
115,480
  
Canada
    
16,531
      
14,336
      
12,569
  
Total
   $
127,316
     $
120,624
     $
128,049