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Available-for-sale Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Available-for-sale Securities [Abstract]      
Available-for-sale securities, cost $ 1,614 $ 1,614  
Available-for-sale securities, market value 1,603 1,676  
Unrealized gain (loss) on available-for-sale securities $ (73) $ 33 $ 57