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Note 15 - Business Segments (Tables)
3 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended June 30,
 
   
2020
   
2019
 
Revenues:
     
 
     
 
Grid
  $
17,715
    $
9,855
 
Wind
   
3,498
     
3,915
 
Total
  $
21,213
    $
13,770
 
   
Three Months Ended June 30,
 
   
2020
   
2019
 
Operating loss:
     
 
     
 
Grid
  $
(1,188
)   $
(4,663
)
Wind
   
(1,120
)    
(1,324
)
Unallocated corporate expenses
   
(909
)    
(249
)
Total
  $
(3,217
)   $
(6,236
)
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
   
June 30, 2020
   
March 31, 2020
 
Grid
  $
34,651
    $
44,044
 
Wind
   
11,293
     
14,250
 
Corporate assets
   
63,726
     
65,815
 
Total
  $
109,670
    $
124,109