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Note 8 - Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
Three months ended March 31, 2019
    
Three months ended March 31, 2018
  
Common stock
  
 
 
 
  
 
 
 
Balance, beginning of period
    $
17
      $
8
  
Balance, end of period
    
17
      
8
  
                 
Additional paid-in capital
  
 
 
 
  
 
 
 
Balance, beginning of period
    $
57,840
      $
47,464
  
Share-based compensation expense
    
74
      
137
  
Proceeds from employee stock purchase plan
    
9
      
11
  
Balance, end of period
    
57,923
      
47,612
  
                 
Accumulated other comprehensive loss
  
 
 
 
  
 
 
 
Balance, beginning of period
    $
(181
 )    $
(65
 )
Unrealized gain (loss) on available-for-sale securities, net of tax
    
70
      
(70
 )
Foreign currency translation adjustment
    
(26
 )    
22
  
Balance, end of period
    
(137
 )    
(113
 )
                 
Retained earnings (accumulated deficit)
  
 
 
 
  
 
 
 
Balance, beginning of period
    $
(5,475
 )    $
9,160
  
Stock repurchased
    
-
      
(147
 )
Cash dividends, $0.07 per share
    
-
      
(583
 )
Impact on retained earnings for change in revenue recognition policy
    
-
      
2,783
  
Net loss
    
(2,349
 )    
(1,846
 )
Balance, end of period
    $
(7,824
 )    $
9,367
  
                 
Total shareholders' equity
    $
49,979
      $
56,874