Accounting for Stock-Based Compensation (Detail Textuals) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 24, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, amortization period					3 years
2006 Employee Equity Compensation Restricted Stock Plan ("Employee Plan") | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock, shares issued (in shares)					812,196
2006 Outside Director Equity Compensation Restricted Stock Plan ("Director Plan") | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock, shares issued (in shares)					272,000
Employee and Director Plans | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock, shares issued (in shares)	77,500
Restricted stock issued, fair value (in dollars per share)	$ 17.02
Unrecognized compensation cost of non-vested restricted stock award, period of recognition					3 years
Unrecognized compensation cost related to the non-vested restricted stock awards			$ 2,400,000		$ 2,400,000		$ 2,800,000
Non-vested restricted stock shares outstanding			186,000	231,000	186,000	231,000
Employee and Director Plans | Restricted Stock | General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 406,000	$ 380,000	$ 777,000	$ 753,000
2015 Outside Director Equity Compensation Restricted Stock Plan ("2015 Director Plan) | Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized to issue under the plan		400,000
Percentage of automatic increase in the amount of shares available for issuance		10.00%