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Line of Credit (Detail Textuals) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Line of Credit Facility [Line Items]    
Outstanding amount of line of credit facility $ 209,000 $ 211,000
Line of credit facility    
Line of Credit Facility [Line Items]    
Maximum amount of line of credit facility $ 225,000  
Line of credit facility, basis spread on variable rate (in percent) 3.00%  
Description of variable rate basis 30-day LIBOR  
Line of credit facility, floor rate 1.00%  
Interest rate 4.00% 4.00%
Outstanding amount of line of credit facility $ 209,000 $ 211,000
Amount available under the line of credit $ 16,000 $ 14,000