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Note 3 - Revenue Recognition (Tables)
 3 Months Ended
Jun. 30, 2018
Notes Tables  
Contract with Customer, Asset and Liability [Table Text Block]
   
Balance
at
Beginning
of
the Period
    
Additions
    
Deductions
    
Balance
at
the end
of
the Period
  
   
(in thousands)
  
Contract Assets
   $
189
     $
466
     $
12
     $
643
  
Contract Liabilities: Deferred Revenue
   $
(806
 )   $
(248
 )   $
787
     $
257
  
Disaggregation of Revenue [Table Text Block]
Revenue recognized in the period from:
        
Amounts included in contract liabilities at the beginning of the period:
        
Performance obligations satisfied
   $
559
  
New activities in the period:
        
Changes in estimates
    
(29
 )
Performance obligations satisfied
    
2,313
  
Total services revenue
   $
2,843