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Note 4 - Supplement Balance Sheet Information (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
Raw materials
  $
8,144
    $
6,804
 
Work-in-process
   
306
     
428
 
Finished goods
   
13,915
     
2,524
 
Less: reserve
   
(3,561
)    
(2,984
)
Inventories, net
  $
18,804
    $
6,772
 
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
   
Gross Carrying Amount
   
Accumulated Amortization
   
Net Carrying Amount
   
Gross Carrying Amount
   
Accumulated Amortization
   
Net Carrying Amount
 
Intellectual property
  $
16,335
    $
(6,060
)   $
10,275
    $
7,690
    $
(5,301
)   $
2,389
 
Trade names
   
6,136
     
(2,836
)    
3,300
     
3,739
     
(2,542
)    
1,197
 
Customer relationships
   
110,873
     
(36,464
)    
74,409
     
61,198
     
(31,584
)    
29,614
 
Non-compete agreements
   
1,747
     
(1,654
)    
93
     
1,581
     
(1,562
)    
19
 
Total
  $
135,091
    $
(47,014
)   $
88,077
    $
74,208
    $
(40,989
)   $
33,219
 
Schedule of Accrued Liabilities [Table Text Block]
   
December 31, 2019
   
March 31, 2019
 
Taxes
  $
3,354
    $
2,356
 
Current lease liabilities
   
1,144
     
--
 
Interest payable
   
909
     
80
 
Professional services fees
   
857
     
334
 
Other
   
1,741
     
1,234
 
Total other accrued expenses
  $
8,005
    $
4,004