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Note 7 - Leases (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending March 31
 
(in thousands)
 
2019
  $
626
 
2020
   
636
 
2021
   
536
 
2022
   
535
 
2023
   
456
 
Thereafter
   
3,815
 
Total minimum lease payments
  $
6,604