Interest Rate Swap Agreements (Detail Textuals) $ in Millions		1 Months Ended	12 Months Ended
	Jun. 04, 2012 USD ($)	Jul. 30, 2012 USD ($)	Mar. 31, 2018 Swapagreements	Mar. 31, 2017
Derivatives, Fair Value [Line Items]
Number of interest rate swap agreements | Swapagreements			2
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Fixed rate paid	1.00%	0.87%	0.91%	0.94%
Interest rate swap period	5 years	5 years
Description of variable rate of the interest rate	1-month LIBOR	1-month LIBOR
Derivative notional amount | $	$ 25.0	$ 25.0