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Note 11 - Lease Arrangements (Tables)
12 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ended March 31,
       
2018
  $
3,256,000
 
2019
   
2,076,000
 
2020
   
1,453,000
 
2021
   
842,000
 
2022
   
725,000
 
Thereafter
   
5,103,000
 
Total minimum lease payments
  $
13,455,000