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Note 14 - Selected Interim Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]

201
9
  
First

Quarter
    
Second
Quarter
    
Third

Quarter
    
Fourth
Quarter
  
Revenues
   $
27,652
     $
28,446
     $
29,440
     $
30,627
  
Income from operations
   $
8,141
     $
8,823
     $
8,510
     $
8,022
  
Net loss
   $
(133
 )   $
(1,158
 )   $
(182
 )   $
(2,650
 )
Net loss attributable to common stockholders
   $
(54
 )   $
(467
 )   $
(73
 )   $
(1,071
 )
Basic and diluted net loss per share
   $
(0.01
 )   $
(0.03
 )   $
(0.01
 )   $
(0.06
 )

201
8
  
First

Quarter
    
Second
Quarter
    
Third

Quarter
    
Fourth
Quarter
  
Revenues
   $
26,868
     $
27,300
     $
27,948
     $
27,881
  
Income from operations
   $
6,530
     $
8,316
     $
9,109
     $
8,503
  
Net income (loss)
   $
(8,994
 )   $
308
     $
1,251
     $
(1,566
 )
Net income (loss) attributable to common stockholders
   $
(3,630
 )   $
124
     $
505
     $
(632
 )
Basic and diluted net income (loss) per share
   $
(0.21
 )   $
0.00
     $
0.02
     $
(0.04
 )