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Note 3 - Stock-based Compensation (Tables)
3 Months Ended
Jun. 30, 2019
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
Cost of revenues
  $
3
    $
40
 
Research and development
   
10
     
51
 
Selling, general and administrative
   
236
     
694
 
Total
  $
249
    $
785
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three Months Ended June 30,
 
   
2019
   
2018
 
Expected volatility
   
66.5
%    
N/A
 
Risk-free interest rate
   
1.8
%    
N/A
 
Expected life (years)
   
5.91
     
N/A
 
Dividend yield
 
None
     
N/A