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Accounting for Stock-Based Compensation (Detail Textuals) (Restricted Stock, USD $)
 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jul. 31, 2013
Employees and Outside Directors
Sep. 30, 2013
2006 Employee Equity Compensation Restricted Stock Plan
Sep. 30, 2013
2006 Employee Equity Compensation Restricted Stock Plan
General and Administrative Expense
Sep. 30, 2012
2006 Employee Equity Compensation Restricted Stock Plan
General and Administrative Expense
Sep. 30, 2013
2006 Employee Equity Compensation Restricted Stock Plan
General and Administrative Expense
Sep. 30, 2012
2006 Employee Equity Compensation Restricted Stock Plan
General and Administrative Expense
Sep. 30, 2013
2006 Outside Director Equity Compensation Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Restricted common stock, shares issued (in shares)       731,627         212,000
Issuance of restricted shares (in shares)     83,000            
Restricted common stock, fair value per share     $ 16.75            
Restriction period for amortization of fair value of stock based compensation awards 3 years                
Recognized compensation expense related to the Employee and Director Plans         $ 370,000 $ 485,000 $ 732,000 $ 1,000,000  
Unrecognized compensation cost related to the non-vested restricted stock awards $ 3,200,000 $ 2,000,000              
Unrecognized compensation cost of non-vested restricted stock award, period of recognition 3 years                
Non-vested restricted stock shares 266,000 198,000