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Note 13 - Share-based Payments (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Three months ended June 30,
    
Three months ended June 30,
  
   
2017
    
2016
  
   
Number of
shares
   
Weighted
average
e
xercise
price per
share
   
Number of
shares
   
Weighted
average
exercise
price per
share
 
                                 
Outstanding, beginning of period
   
430,611
     $
15.46
      
550,641
     $
10.48
  
Granted
   
-
      
-
      
8,000
      
23.37
  
Exercised
   
(66,746
 )    
8.26
      
(51,963
 )    
3.52
  
Forfeited
   
(257
 )    
11.43
      
(4,088
 )    
23.83
  
Expired
   
-
      
-
      
-
      
-
  
Outstanding, end of period
   
363,608
      
16.79
      
502,590
      
11.30
  
Options exercisable, end of period
   
213,769
     $
11.46
      
298,343
     $
7.08
  
   
Six months ended June 30,
   
Six months ended June 30,
 
   
2017
   
2016
 
   
Number of
shares
   
Weighted
average
exercise
price per
share
   
Number of shares
   
Weighted
average
exercise
price per
share
 
                                 
Outstanding, beginning of period
   
474,501
     $
12.67
      
513,366
     $
9.24
  
Granted
   
32,875
      
40.56
      
63,000
      
21.21
  
Exercised
   
(135,622
 )    
8.04
      
(63,537
 )    
3.72
  
Forfeited
   
(8,146
 )    
18.24
      
(9,489
 )    
17.23
  
Expired
   
-
      
-
      
(750
 )    
3.76
  
Outstanding, end of period
   
363,608
      
16.79
      
502,590
      
11.30
  
Options exercisable, end of period
   
213,769
     $
11.46
      
298,343
     $
7.08
  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
       
Options outstanding
    
Options exercisable
  
Exercise price
  
Number
outstanding
   
Weighted
average
exercis
e
price per
share
   
Weighted
average
remaining
contractual
l
ife (years)
   
Aggregate
intrinsic
value
   
Number
exercisable
   
Weighted
average
exercise
price per
share
   
Weighted
average
remaining
contractual
life (years)
   
Aggregate
intrinsic
value
 
                                                                     
$2.92 
-
$8.92
    
123,395
     $
6.46
      
1.9
     $
5,853,446
      
123,395
     $
6.46
      
1.9
     $
5,853,446
  
$10.16
-
$19.95
    
126,338
      
16.28
      
4.0
      
4,752,589
      
64,124
      
16.01
      
3.7
      
2,429,911
  
$21.10
-
$27.53
    
81,000
      
23.65
      
4.7
      
2,450,242
      
26,250
      
23.86
      
3.8
      
788,625
  
$35.25
-
$37.35
    
14,375
      
35.89
      
5.9
      
258,906
      
-
      
-
      
-
      
-
  
$43.15
-
$47.00
    
18,500
      
44.19
      
6.6
      
179,625
      
-
      
-
      
-
      
-
  
 
 
 
    
363,608
     $
16.79
      
3.6
     $
13,494,808
      
213,769
     $
11.46
      
2.7
     $
9,071,982