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Note 14 - Quarterly Results of Operations (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
                                 
(in thousands except per share amounts)                                
   
Mar. 31,
   
June 30,
   
Sep. 30,
   
Dec. 31,
 
Quarters ended
 
2019
   
2019
   
2019
   
2019
 
                                 
Total revenue
  $
219,181
    $
219,298
    $
222,914
    $
233,135
 
Operating income (loss)
   
5,426
     
8,844
     
(1,931
)    
3,695
 
Net income (loss)
   
4,433
     
6,071
     
(3,189
)    
1,162
 
Basic income (loss) per share
   
0.24
     
0.33
     
(0.17
)    
0.06
 
Diluted income (loss) per share
   
0.24
     
0.33
     
(0.17
)    
0.05
 
                                 
(in thousands except per share amounts)                                
   
Mar. 31,
   
June 30,
   
Sep. 30,
   
Dec. 31,
 
Quarters ended
 
2018
   
2018
   
2018
   
2018
 
                                 
Total revenue
  $
173,566
    $
196,318
    $
243,303
    $
272,268
 
Operating income
   
6,425
     
14,065
     
16,181
     
22,315
 
Net income
   
4,417
     
9,971
     
11,614
     
16,501
 
Basic income per share
   
0.24
     
0.54
     
0.63
     
0.91
 
Diluted income per share
   
0.24
     
0.54
     
0.63
     
0.89