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Note 13 - Share-based Payments (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Three months ended September 30,
   
Three months ended September 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
    
363,608
     $
16.79
      
502,590
     $
11.30
  
Granted
    
327,150
      
55.49
      
18,750
      
27.53
  
Exercised
    
(30,051
 )    
6.67
      
(31,065
 )    
38.00
  
Forfeited
    
(1,050
 )    
51.87
      
-
      
-
  
Expired
    
-
      
-
      
-
      
-
  
Outstanding, end of period
    
659,657
      
36.39
      
490,275
      
12.39
  
Options exercisable, end of period
    
223,043
     $
14.30
      
306,553
     $
9.16
  
   
Nine months ended September 30,
   
Nine months ended September 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
    
360,025
      
54.13
      
81,750
      
22.66
  
Exercised
    
(165,673
 )    
7.79
      
(94,602
 )    
3.75
  
Forfeited
    
(9,196
 )    
22.08
      
(9,489
 )    
17.23
  
Expired
    
-
      
-
      
(750
 )    
3.76
  
Outstanding, end of period
    
659,657
      
36.39
      
490,275
      
12.39
  
Options exercisable, end of period
    
223,043
     $
14.30
      
306,553
     $
9.16
  
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
exercise
price per
share
   
Weighted
average
remaining
contractual
life (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
    
96,644
     $
6.72
      
1.9
     $
5,008,805
      
96,644
     $
6.72
      
1.9
     $
5,008,805
  
$10.16
-
$19.95
    
122,938
      
16.29
      
3.7
      
5,195,152
      
76,399
      
15.99
      
3.5
      
3,251,248
  
$21.10
-
$27.53
    
81,000
      
23.65
      
4.4
      
2,826,893
      
45,000
      
25.39
      
3.7
      
1,492,313
  
$35.25
-
$37.35
    
14,375
      
35.89
      
5.7
      
325,750
      
5,000
      
35.25
      
6.2
      
116,500
  
$43.15
-
$47.00
    
18,500
      
44.19
      
6.3
      
265,650
      
-
      
-
      
-
      
-
  
$53.55
-
$55.65
    
326,200
      
55.49
      
6.7
      
998,480
      
-
      
-
      
-
      
-
  
 
 
 
    
659,657
     $
36.39
      
5.1
     $
14,620,730
      
223,043
     $
14.30
      
2.9
     $
9,868,866