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Note 17 - Quarterly Financial Data (Unaudited)
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
17.
Quarterly Financial Data (Unaudited)
 
Year 2016   Quarter ended
December 31
  Quarter ended
September 30
  Quarter ended
June 30
  Quarter ended
March 31
Product revenue   $
28,296
    $
25,783
    $
26,575
    $
22,278
 
Total revenue    
28,726
     
25,789
     
26,581
     
22,283
 
Cost of product revenue    
7,539
     
4,998
     
6,065
     
5,425
 
Gross profit on product revenue    
20,757
     
20,785
     
20,510
     
16,853
 
Net income   $
8,085
    $
8,952
    $
8,615
    $
6,895
 
Per common share information:                                
Basic net income per share   $
0.56
    $
0.61
    $
0.59
    $
0.46
 
Basic common shares outstanding    
14,538
     
14,625
     
14,679
     
14,875
 
Diluted net income per share   $
0.54
    $
0.59
    $
0.57
    $
0.45
 
Diluted common shares outstanding    
14,979
     
15,077
     
15,111
     
15,307
 
 
 
Year 2015   Quarter ended
December 31
  Quarter ended
September 30
  Quarter ended
June 30
  Quarter ended
March 31
Product revenue   $
25,607
    $
23,676
    $
22,898
    $
15,515
 
Total revenue    
30,894
     
23,681
     
22,904
     
15,520
 
Cost of product revenue    
6,290
     
5,176
     
5,274
     
4,313
 
Gross profit on product revenue    
19,317
     
18,500
     
17,624
     
11,202
 
Net income   $
11,042
    $
8,380
    $
7,820
    $
3,516
 
Per common share information:                                
 Basic net income per share   $
0.74
    $
0.56
    $
0.52
    $
0.24
 
Basic common shares outstanding    
14,965
     
14,967
     
14,961
     
14,905
 
Diluted net income per share   $
0.72
    $
0.55
    $
0.51
    $
0.23
 
Diluted common shares outstanding    
15,353
     
15,316
     
15,336
     
15,330